Avaya G3PBX User Manual

Avaya

Computer-Telephony 1.2

G3PBX Driver and CVLAN Administration and Maintenance Guide

Issue 1 December 2002

Notice

Every effort was made to ensure that the information in this document was complete and accurate at the time of printing. However, information is subject to change. Preventing Toll Fraud "Toll fraud" is the unauthorized use of your telecommunications system by an unauthorized party (for example, a person who is not a corporate employee, agent, subcontractor, or working on your company's behalf). Be aware that there may be a risk of toll fraud associated with your system and that, if toll fraud occurs, it can result in substantial additional charges for your telecommunications services.

Avaya Fraud Intervention

If you suspect that you are being victimized by toll fraud and you need technical assistance or support, call Technical Service Center Toll Fraud Intervention Hotline at +1 800 643 2353 for the United States and Canada. For additional support telephone numbers, see the Avaya Web site: http://www.avaya.com Select Support, then select Escalation Lists US and International. This Web site includes telephone numbers for escalation within the United States. For escalation telephone numbers outside the United States, select Global Escalation List.

Providing Telecommunications Security

Telecommunicat ions secur ity (of voice, data, and/or video communications) is the prevention of any type of intrusion to (that is, either unauthorized or malicious access to or use of) your company's telecommunications equipment by some party.Your company's "telecommunications equipment" includes both this Avaya product and any other voice/data/video equipment that could be accessed via this Avaya product (that is, "networked equipment"). An "outside party" is anyone who is not a corporate employee, agent, subcontractor, or working on your company's behalf. Whereas, a "malicious party" is anyone (including someone who may be otherwise authorized) who accesses your telecommunications equipment with either malicious or mischievous intent. Such intrusions may be either to/through synchronous (time-multiplexed and/or circuit-based) or asynchronous (character-, message-, or packet-based) equipment or interfaces for reasons of:

■ Utilization (of capabilities special to the accessed

equipment)

■ Theft (such as, of intellectual property, financial assets,or

toll-facility access)

■ Eavesdropping (privacy invasions to humans)

■ Mischief (troubling, but apparently innocuous, tampering)

■ Harm (such as harmful tampering, data loss or alteration,

regardless of motive or intent) Be aware that there may be a risk of unauthorized intrusions associated with your system and/or its networked equipment. Also realize that, if such an intrusion should occur, it could result in a variety of losses to your company (including but not limited to, human/data privacy, intellectual property, material assets, financial resources, labor costs, and/or legal costs).

Your Responsibility for Your Company's T ele com mun icati ons Secu r ity

The final responsibility for securing both this system and its networked equipment rests with you - an Avaya customer's system administrator, your telecommunications peers, and your managers. Base the fulfillment of your responsibility on acquired knowledge and resources from a variety of sources including but not limited to:

■ Installation documents

■ System administration documents

■ Security documents

■ Hardware-/software-based security tools

■ Shared information between you and your peers

■ Telecommunications security experts

To prevent intrusions to your telecommunications equipment, you and your peers should carefully program and configure: q your Avaya-provided telecommunications systems and their interfaces

■ your Avaya-provided software applications, as well as their

■ underlying hardware/software platforms and interfaces

■ any other equipment networked to your Avaya products.

Trademarks

Adobe, Adobe Acrobat, and the Adobe logo are registered trademarks of Adobe Systems, Inc. Avaya and MultiVantage are trademarks of Avaya, Inc. CallVisor, DEFINITY, and the Avaya logotype are registered trademarks of Avaya, Inc. Internet Explorer is a trademark of SyNet, Inc. Microsoft, DOS, Windows, Windows NT, Windows 2000, Windows XP, Win32, and the Microsoft logo are registered trademarks and Windows for WorkGroups, Windows 95, and Windows 98 are trademarks of Microsoft. Netscape Navigator is a registered trademark of Netscape Communications. Pentium is a registered trademark of Intel Corporation. Sun, Sun Microsystems and the Sun logo are registered trademarks and Java, Solaris, and Solaris SPARC are trademarks of Sun Microsystems, Inc. in the USA and other countries. UNIX is a registered trademark in the USA and other countries, licensed exclusively through X/Open Company Limited. UnixWare is a registered trademark of the Santa Cruz Operation, Inc. in the USA and other countries. All products and company names are trademarks or registered trademarks of their respective holders.

Avaya Support

Avaya provides a telephone number for you to use to report problems or to ask questions about your contact center. The support telephone number is 1-800-242-2121 in the United States. For additional support telephone numbers, see the Avaya Web site: http://www.avaya.com Select Support, then select Escalation Lists US and International. This Web site includes telephone numbers for escalation within the United States. For escalation telephone numbers outside the United States, select Global Escalation List .

1 Introduction 1-1

■ About this Guide 1-1

■ Reason for Reissue 1-1

■ Organization of This Document 1-2

■ Overview of DEFINITY G3 PBX Driver 1-2

■ Network Latency Requirements 1-4

Requirements for Vectors

with Adjunct Route Steps 1-4

■ Terms Used in This Guide 1-5

■ Related Documents 1-6

For More Information About

Avaya Products and Service 1-7

2 Security and Configuration 2-1

■ Overview 2-1

■ Security Issues 2-1

Restricting Administration Permissions 2-2 Configuring the Tserver for a Secure

LAN Gateway Connection 2-2

Requirements for Dual NIC Configurations 2-2

■ Using the G3 PBX Configuration Utilities 2-3

Changing the G3PD and CVLAN Configuration 2-3 Tunable G3PD Configuration Parameters 2-8

Additional Configuration Parameters 2-12

Changing IP Address or Hostname of Active Link 2-12

■ Configuring Avaya CT

In a Firewall Environment 2-14

Requirements for Configuring

Avaya CT in a Firewall Environment 2-14

Administering Multiple Avaya CT

Servers to Ensure Unique Links 2-17

Sample Scenario 2-17

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Contents

3 Maintenance 3-1

■ Overview 3-1

■ Starting the DEFINITY G3PD Administrator Utility 3-2

■ File Menu Options 3-4

■ Maint Menu Options 3-4

Block/Enable Command 3-5 Link Status Command 3-7 Offline/Online Command 3-9 Restart Command 3-10 Suspend/Resume Alarms Command 3-12 Test Command 3-14 Version Command 3-16

■ Help Menu Options 3-17

4 Troubleshooting 4-1

■ Overview 4-1

■ Problem Descriptions 4-2

G3PD Not Starting 4-2 Switch Connection Not Up 4-2 Clients Fail to Connect to Visible G3PD 4-3 Switch Link "Talking" But Not In Service

(Authentication Failed for ADJLK Connection) 4-4

Clients Cannot See Advertised PBX Driver

(G3PD Not Visible to DEFINITY G3PD

Administrator Utility) 4-4 Not All Events Received by Application 4-5 Slow Performance 4-5 G3PD Stops Responding 4-5 Users Receive CSTA Universal Failure Messages

with RESOURCE_OUT_OF_SERVICE (34) or

Notified Device Monitoring Ended 4-6 Users Receive ACS Universal Failure Messages

with TSERVER_DRIVER_CONGESTION (73) 4-6

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Users Receive ACS Universal Failure Messages

with TSERVER_NO_TDI_BUFFERS (74) 4-6

Users Receive Route End Report

with PEFORMANCE_LIMIT_EXCEEDED (52) 4-7

Users Receive CSTA Universal Failure Messages

with GENERIC_SUBSCRIBED_RESOURCE_ AVAILABILITY (41) 4-7

Questions about Switch Feature Operations? 4-7

■ LAN Link Problem Descriptions 4-8

LAN Link Will Not Initialize 4-8 DEFINITY G3PD Administrator Utility Reports

LAN Link Status Not Talking 4-9

How Dropped Link Affects T

elephony Services Reque sts 4-13

How Dropped Link Affects Open Streams 4-14

■ Tserver Error Log 4-14

IN Index IN-1

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Contents

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Introduction

About this Guide

This document describes configuration, maintenance, and troubleshooting of the DEFINITY® G3 PBX Driver (G3PD) for Telephony Services. Information in this document is provided for Telephony Services administrators and the Services organization that assists administrators when they experience problems with the G3PD.

Reason for Reissue

This document is reissued for Avaya Computer Telephony, Release 1.2 with the following updates:

n To describe configuring Avaya CT in a firewall environment. This document

describes how to configure Avaya CT when a firewall is placed between the Avaya CT server and the MultiV antage Switch. See ‘‘Configuring Avaya CT In a Firewall Environment’’ on page 2-14.

For information about other supported firewall environments, see Avaya Computer T elephony, Telephony Services Administration and Maintenance (NETMANGD.PDF).

n To introduce the following new product terminology:

— Avaya Computer Telephony (the successor to CentreVu Computer

Telephony)

— Avaya MultiVantage (the successor to DEFINITY). The term

DEFINITY is still used in this document, and, from the viewpoint of this document, the terms DEFINITY and MultiVantage are synonymous.

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Introduction

Organization of This Document

This document is organized as follows: Chapter 1, "Introduction" provides a list of chapters in this document, an overview

of the DEFINITY G3 PBX Driver, terminology important to the understanding of Computer-Telephony Integration (CTI) and a list of related documents.

Chapter 2, "Security and Configuration" describes security measures and how to reconfigure the G3PD using the G3 PBX Driver Configuration utility. Instructions are also provided on how to use the PBX Link Change utility to change the IP address or hostname of an active link.

Chapter 3, "Maintenance" describes the tools that can be used to observe and test the G3PD. An Operations, Administration, and Maintenance (OA&M) utility, the DEFINITY G3PD Administrator utility, can be used from a Microsoft Windows 2000, Windows NT (4.0 or later), Windows XP, or Windows 95 machine to perform OA&M tasks.

Chapter 4, "Troubleshooting " describes problems that can occur with the DEFINITY G3 PBX Driver (G3PD), the switches, and the switch links, and suggests possible solutions to these problems.

Overview of DEFINITY G3 PBX Driver

The DEFINITY G3 PBX Driver (G3PD) allows Telephony Services applications to communicate with a DEFINITY G3 PBX.

n Telephony Services applications access the G3PD through Telephony

Services (the security database and advertised services).

n CVLAN applications bypass Telephony Services and access an ASAI link

directly using CallVisor Adjunct Switch Application Interface (ASAI) messages.

The primary function of the G3PD is to interpret Computer Supported Telecommunications Application (CSTA) requests made by Telephony Services applications and to forward them to the PBX. To do this, the G3PD converts the CSTA requests into CallVisor ASAI messages, and uses the CVLAN API to send and receive these messages across an ASAI link connecting your Tserver to the DEFINITY ECS system. Customer applications on the Tserver can use this API directly. In addition, clients can access the API with CVLAN. See Figure 1-1.

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Introduction

Avaya MultiVantage

Avaya CT Server

Tserver clients

Tserver

G3PD

CVLAN

CVLAN clients

Figure 1-1. DEFINITY CTI Client Server Diagram

Adjunct (ADJLK) links are provided over Ethernet. A Network Interface Card (NIC) is installed in the Tserver to provide a link to a DEFINITY LAN Gateway. DEFINITY LAN Gateway functionality is provided by the software running on the Multi-function Board (MFB) or the Multi-Application Platform for DEFINITY (MAPD) in the DEFINITY switch.

When installed with the ADJLK license (i.e., the station type parameter is administered as ADJLK at the switch), G3PD supports both ASAI and ADJL K lin k administration. When the ASAI license is used during G3PD installation (i.e., the station type parameter is administered as ASAI at the switch), only switch ASAI link administration is supported.

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Introduction

Network Latency Requirements

This section describes the network latency requirements, for the customer’s network, that are needed to support CTI links over a LAN/WAN. These are links, connected via a LAN/WAN, between the Avaya CT server and the MAPD based DLG in an Avaya MultiVantage server that supports the MAPD, such as Avaya MultiVantage S8700 Media Server.

Follow these requirements to maintain the CTI link over a LAN/WAN.

n Round Trip Time

A maximum 200 millisecond (ms) average round trip packet delivery time as measured with "ping" over every one hour time period.

n Spiked Delays

Periodic spiked delays of no more than five seconds while maintaining the 200 ms average round trip delivery time as measured with "ping" over every one hour time period.

Requirements for Vectors with Adjunct Route Steps

Vectors with "adjunct route" steps to the CTI server are connected over this LAN/WAN link.

n If MultiVantage (Avaya call processing) is going to issue route requests,

then the associated "wait" step must always have a value greater than the largest periodic spiked delay.

n With a maximum of five seconds allowed (see Spiked Delays), your “wait”

step should be greater than five seconds.

n If you can guarantee periodic spiked delays less than five seconds, you

can reduce the “wait” step time out accordingly.

n If no response to a route select is received by MultiVantage (Avaya call

processing), the call will follow the remaining vector steps in this specific vector. In other words, you should program the vector to deal with the possibility that the “adjunct route” step might time out.

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Introduction

Terms Used in This Guide

In this guide, the following terms are used with the meanings shown below: ADJLK Adjunct link(s). Label for the driver authorization disk or the

switch station type which is required to enable the appropriate link connection and is provided with the G3PD.

ASAI Adjunct Switch Application Interface. An option on the

DEFINITY ECS switch that enables the ASAI Messaging Interface between the switch and an Adjunct Processor (such as a Tserver). This messaging interface allows the Adjunct Processor to perform call monitoring and control functions. Also known as CallVisor ASAI.

CVLAN CallVisor Local Area Network (CVLAN) software

implements the ASAI protocol on PCs on a LAN and provides mapping to an application program interface (API) for application software.

CSTA Computer Supported Telecommunications Applications. A

CTI standard established by the European Computer

Manufacturers Association (ECMA). CTI Computer-Te le phon y Integ r atio n DEFINITY

LAN Gateway (DLG)

This gateway provides a virtual point-to-point connection

between a particular Telephony Server and an associated

port on the DEFINITY ECS switch. It translates Adjunct

Switch Application Interface ASAI) messages from

Q.931/Q.932 synchronous data frames to TCP/IP Ethernet

packets. DLG is:

n a software package that provides implementation of the

Ethernet-Switch Application Interface (ESAI).

n hardware used to run DLG software. Also known as the

ESAI tunnel protocol.

G3 PBX Driver (G3PD)

The G3 PBX Driver is a Dynamic Link Library (DLL) on a

Windows NT machine. The G3PD software communicates

with both the DEFINITY G3 PBX and the Tserver to provide

switch services to Telephony Services applications. Private Data

Support Library

Private data is a mechanism that allows a switch to provide

value-added services that go beyond those defined in

CSTA. The G3PD provides a number of private data

services (for example, switch-collected call prompter digits

in events, or sending Dual Tone Multi-Frequency (DTMF)

tones that make up the support library). LAN Local Area Network.

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Introduction

MAPD Multi-Application Platform for DEFINITY ECS. The MAPD

resides in a DEFINITY ECS carrier. It serves as an ISDN brouter of ASAI messages through a TCP “tunnel” via 10Base-T Ethernet. A menu-based application allows OA&M for the DEFINITY LAN Gateway. MAPD provides DLG functionality; it can run in DLG mode, act as a CVLAN server, or do both simultaneously.

NIC Network Interface Card. A circuit board residing in the

Tserve r that provide s an inte rface to the DEFINITY LAN Gateway or to the local area network (LAN) with Tserver clients.

NT machine A general name for any one of the following Windows NT

3.51 or 4.0 machines: NT Workstation, NT Server, NT Backup Domain Controller, and NT Primary Domain Controller.

PBX Driver A PBX-specific Dynamic Link Library (DLL) that receives

TSAPI messages from a Telephony Server, reformats them into a set of messages understood by the PBX, and sends the reformatted messages to the PBX over a CTI link. Provided by the vendor supplying the PBX and CSTA services for a switch. The G3PD is a PBX driver.

Telephony Server

TSAPI Telephony Services Application Programming Interface. The

Tserver A program installed on a Windows NT, 4.0 (or higher) ;

Security and Configuration

Overview

This chapter provides information on how to keep your network secure when using Avaya Computer Telephony (Avaya CT). In addition, it provides step-by-step instruc tion s on using the G3 PBX co nfi gurati on uti lit ies.

Security Issues

This chapter covers the following security-related topics.

■ ‘‘Restricting Administration Permissions’’ on page 2-2

■ ‘‘Configuring the Tserver for a Secure LAN Gateway Connection’’ on page

2-2

■ ‘‘Configuring Avaya CT In a Firewall Environment’’ on page 2-14

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Restricting Administration Permissions

To ensure your environment’s security, it is recommended that you use multiple-level administration permission to control which users are allowed to grant administration permissions. For details, see “Controlling SDB Administration Access” in Chapter 4 of Avaya Computer Telephony, Telephony Services Administration and Mainte nan ce (NETMANGD.PDF).

Configuring the Tserver for a Secure LAN Gateway Connection

Although the Avaya CT server can be configured using a single NIC, it is recommended that you configure the Avaya CT server with dual NICs, as follows.

■ Configure one NIC to communicate with the client LAN (or WAN). This NIC

can be Ethernet (10BaseT, 100BaseT, or 1000BaseT), T oken Ring, or Fiber Distributed Data Interface (FDDI).

■ Configure the second NIC to communicate with the DLG (which could be

either Co-Resident on the MultiVantage server or on the MAPD). The Co-Resident DLG can use Ethernet 10BaseT or 100BaseT and the MAPD DLG uses Ethernet 10baseT. This NIC should be on a private isolated segment.

There should be no IP forwarding on the Avaya CT server — that is, there should be no IP forwarding between the Network Interface Card (NIC) used for the DEFINITY LAN Gateway and the NIC used for client access.

Requirements for Dual NIC Configurations

Follow these requirements for the MAPD based DLG or the Co-Resident DLG.

When Connecting via the MAPD DLG

In a dual NIC configuration, the NIC used by the G3PD must be configured as follows:

■ Ethernet 10BaseT

■ Half duplex

■ IP forwarding disabled

When Connecting via the Co-Resident DLG

In a dual NIC configuration, the NIC card used by the G3PD must be administered as follows:

■ Ethernet 10BaseT or 100BaseT

■ Half duplex

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■ IP forwarding disabled

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Security and Configuration

Using the G3 PBX Configuration Utilities

During installation of the DEFINITY G3 PBX Driver (G3PD) and CVLAN, administration of the driver is automatically performed. Following installation, you can view and make changes to the G3PD configuration, if necessary, by running the G3 PBX Driver Configuration utilities, that is, the G3 PBX Driver Configuration utility or the G3 PBX Link Change utility. These utilities are run from the Avaya CT sever.

The G3 PBX Configuration and G3 PBX Link Change utilities are discussed in the following sections:

■ See ‘‘Changing the G3PD and CVLAN Configuration’’ to add or remove a

link, change an IP address or hostname, change an advanced configuration parameter, or view the current configuration.

CAUTION:

The advanced configuration parameters listed in Table 2-2 are established by default during the installation of the G3PD. In rare instances, you may have to change them (most likely under the direction of the TSO). Under normal circumstances, there is no reason to change them.

■ See ‘‘Tunable G3PD Configuration Parameters’’ for descriptions of the

standard G3PD configuration parameters, as well as the advanced configuration parameters, that are established by default during installation.

■ See ‘‘Changing IP Address or Hostname of Active Link’’ to change an IP

address or hostname of an active link, without the need to stop the G3PD and/or CVLAN services.

Changing the G3PD and CVLAN Configuration

Use the G3 PBX Driver Configuration Utility to change the G3PD configuration or the CVLAN configuration. With this utility, you can:

■ add or remove a link

■ change an IP address or hostname of a link

■ change an advanced configuration parameter

■ view the configuration

NOTE:

To change an IP address or hostname of an active link (without unloading the G3PD or CVLAN service) and have these changes take effect

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immediately, use the G3 PBX Link Change Utility. Refer to ‘‘Changing IP Address or Hostname of Active Link’’ later in this chapter.

To add or remove a link, change an IP address or hostname, change the advanced configuration parameters, or view the G3PD configuration, take the following steps:

1. Make sure that the G3PD is not loaded.

2. Make sure the CVLAN service is stopped. if you need to stop the CVLAN service, follow these steps:

a. From the Control Panel double-click Administrative Tools, and

then double-click Services. b. Select CVLAN Server from the list of services. c. Click the Stop button.

3. Click Start, point to Programs, Avaya Computer Telephony, DEFINITY G3 PBX Driver, and click G3 PBX Driver Configuration.

If the G3PD or CVLAN client is running, you will receive the following warning message:

WARNING:

Either the DEFINITY G3 PBX Driver or a CVLAN Client is running. Changes made to the configuration will not take effect until the next time the DEFINITY G3 PBX Driver is loaded.

4. If you receive the warning message, click OK to proceed.

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The system displays the G3 PBX Driver Configuration Dialog box.

Figure 2-1. G3 PBX Driver Configuration Dialog Box

5. Y ou can accomplish the following tasks in the G3 PBX Driver Configuration dialog box. See Table 2-1 for descriptions of the standard configuration parameters.

■ Change the link assignment by overwriting the fields under

Advertised Switch Name and IP Address or Hostname for any link. Once you have completed your changes, click Next.

■ Add a link by entering a name and IP Address under Advertised

Switch Name and IP Address or Hostname. You can add up to

eight links per Avaya CT server. You can add links in any order that suits your needs, and you can leave these fields blank. (In other words, you can assign links in consecutive number order, odd number order, even number order, or random order.) Once you have completed your changes, click Next.

■ Remove a link by deleting the fields under Advertised Switch

Name and IP Address or Hostname. Once you have completed

your changes, click Next.

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■ Administer CVLAN clients. Click Admin to add, remove, or edit a

CVLAN client. (For more information see Chapter 5 of the Avaya CT Installation Guide — INSTALL.PDF.

6. To change any of the advanced configuration parameters, click Advanced to access the G3 PBX Driver Advanced Configuration dialog box. See Figure 2-2. Refer to Table 2-2 for descriptions of the advanced configuration parameters.

CAUTION:

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Figure 2-2. G3 PBX Driver Advanced Configuration Dialog Box

From the G3 PBX Driver Advanced Configuration dialog box, you can make the following choices.

■ Enter changes and click OK. Your changes will take effect the next

time the G3PD, CVLAN client, or other applications are loaded.

■ Restore the defaults by clicking on Restore Defaults. Then click OK

to exit.

■ Leave the values undisturbed and click Back to return to the G3

PBX Driver Configuration dialog box.

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Tunable G3PD Configuration Parameters

Table 2-1 and Table 2-2 describe the G3PD configuration parameters that can be viewed and administered using the G3 PBX Driver Configuration Utility.

Table 2-1. G3PD Configuration Parameters

PARAMETER DEFAULT COMMENTS

DEFINITY G3 PBX Driver IP Address

Advertised Switch Name (Link 1)

Advertised Switch Name (Links 2 - 8)

IP Address or Hostname (Link 1)

IP Address or Hostname (Links 2 - 8)

Advanced configuration parameters that are flagged with an have the following meanings:

■ Default values for parameters flagged with an asterisk * are reserved for

the Technical Services Organization (TSO) (and you should not change them). These parameters could affect overall system performance.

192.168.25.20 IP address of your DEFINITY G3PD driver

G3_SWITCH Advertised switch name (service name) for link

1. String up to 14 characters in length (will be truncated if it is longer). The # sign is not a valid character.

Advertised switch names (service names) for Links 2 through 8. Each link may be given its own advertised switch name. String can be up to 14 characters in length (will be truncated if it is longer). The # sign is not a valid character.

192.168.25.10 IP address or hostname for Link 1. This IP address refers to the Ethernet interface for the DLG.

IP address or hostname for Links 1 through 8. There may be a separate IP address or hostname for each link.

* or ** in Table 2-2

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■ Default values for parameters flagged with a double asterisk ** are

guidelines. They should be properly sized for optimal performance, but are not subject to strict limitations (for example, if they are sized too large, memory may be wasted; if they are sized too small, performance decreases slightly).

CAUTION:

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Table 2-2. G3PD Advanced Configuration Parameters

PARAMETER DEFAULT COMMENTS

Advertised V endor Name

**NUM SESSIONS

**NUM CALL MONITORS

**NUM DEVICE MONITORS

**NUM SESSION REQUESTS

**NUM SESSION MONITORS

AVAYA Can be AVAYA or LUCENT. If this is a new

installation, choose AVAYA.

NOTE:

If you are upgrading Avaya CT and your applications have LUCENT hardcoded in Tlink names, select the LUCENT setting.

50 Guideline for number of simultaneous sessions

(active acsOpenStream requests). The minimum is 5 and the maximum is 5000.

200 Guideline for number of simultaneous

cstaMonitorCall requests. The minimum is 5 and the maximum is 5000.

200 Guideline for number of simultaneous

cstaMonitorDevice requests. The minimum is 5 and the maximum is 5000.

20 Guideline for number of simultaneous (not

confirmed) CSTA requests for a single session (open stream). The minimum is 5 and the maximum is 5000.

40 Guideline for number of active device or call

monitors for a single session (open stream). The minimum is 5 and the maximum is 5000.

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+ 51 hidden pages