This product has a Caller ID with Call Waiting feature that works with
service from your local phone service provider.
Caller ID with Call Waiting lets you see who’s calling before you answer
the phone,even when you’re on another call.
You may need to change your phone service to use this feature.
Contact your phone service provider if:
•You have both Caller ID and Call Waiting,but as separate
services (you may need combined service)
•You have only Caller ID service,or only Call Waiting service
•You don’t subscribe to any Caller ID or Call Waiting services.
You can use this product with regular Caller ID service,and you can
use this product’s other features without subscribing to either Caller ID
or combined Caller ID with Call Waiting service.
There are fees for Caller ID services,and they may not be available in
all areas.
This product can provide information only if both you and the caller
are in areas offering Caller ID service,and if both telephone companies
use compatible equipment.
About the Call Log
This phone assigns each incoming call a number from 1 to 50.
The most recent call will have the lowest number. When the memory
is full,the oldest call information is deleted to make room for new
incoming call information. See CALLER ID OPERATION,beginning
on page 34,for more details.
If you answer a call before call information appears on the screen,
it will not appear in the call log.
About Adding Handsets
This product is compatible with the AT&T 2300 Expansion Handset.
You may use up to three 2300 units (purchased separately) with this
phone. Follow the instructions provided with the additional handset(s)
for installation and registration.
2
INSTALLATION
Base Installation
NOTE: Install the base unit away from electronic equipment,
¥
such as personal computers, television sets or microwave ovens.
Avoid excessive heat, cold, dust or moisture.
1Connect the power cord to the base and an electrical
outlet not controlled by a wall switch.
Standard
electrical
outlet
Use only the power cord supplied with this product.
If you need a replacement,call 1 800 222–3111.
2Connect the
telephone
line cord.
Modular
telephone
jack
3
3Install the handset battery.
Use onlyAT&T Battery 3301,SKU# 91076.
a) Remove battery
compartment cover by
pressing on indentation
and sliding downward.
b) Plug the battery pack
connector into handset.
Place the battery pack and
wires in the compartment.
c ) Replace cover by
sliding it on its
t ra ck up over
b a t t e ry case until
it snaps fi rm ly
into place.
4Charge the handset battery.
•Place the handset in the base.
•Charge the battery for at least 12 hours. After the first
charge,the battery will charge in eight hours.
5Check for dial tone.
•After the batteries are ch a rge d ,lift the handset and pre s s
;you should hear a dial tone.
4
Headset
You can use this telephone
hands-free when you install
any industry standard 2.5 mm headset (purchased separately).
For best results use an AT&T
2.5 mm headset.
Plug the headset into the jack located on the right side of
the handset (under the small rubber flap). Do not force the connection,
but make sure the plug fits securely.
5
FEATURE SETUP
F e a t u re Setup Menu
NOTE: When you follow the directions to “Clear
¥
MessageWaiting”or “Set Dial Method” you change
settings for ALL registered handsets.All other
features must be set separately at each handset.
(See “About Adding Handsets”on page 2 for
details about additional handsets.)
Press to enter the Feature Setup menu. Use
or to choose features,then press to save your
choice.
Pressat any time to return to the previous menu
item. Pressrepeatedly to exit Feature Setup and
return to the idle screen.
NOTE: If you wait more than 30 seconds
¥
without pressing a key, the handset returns to
the idle screen.
NOTE: If you receive an incoming call while in
¥
Feature Setup, the phone automatically exits the
menu to take the call.
6
Ring Vo l u m e
Adjust the volume of the handset ri n ge r. Setting vo l u m e
to t u rns the ri n ger off and displays the ri n ger off icon
() on scre e n . The default setting is .
1Press . The screen displays
2Press or until the screen displays
3Press . The screen displays
4Use the keypad to enter a volume setting
( – )
— OR —
Press or to hear samples of ring volumes.
5Press to save desired setting.
7
Ring Pattern
The external ring pattern sets which ringer you hear
when you have an outside call. The internal ring
pattern sets which ringer you hear when you have
an intercom call from another registered handset (if
installed). External ring pattern default setting is ;
intercom ring pattern default setting is .
1Press . The screen displays
2Press or until the screen displays
3Press . The screen displays
4Press or then to choose
or .
5Use the keypad to enter a ring pattern
selection ( – )
— OR —
Press or to display desired setting.
A sample of the displayed setting is played
briefly.
6Press to save displayed setting. You will
hear a confirmation tone.
7Press to exit ring pattern setup.
8
Key Click
When this feature is on,each key press makes a sound.
Default setting is .
1Press . The screen displays
2Press or until the screen displays
3Press . The screen displays
4Press or to select .
— OR —
Press or to select .
5Press to save the displayed setting.
9
Handset Name
You can customize the handset to display a name or
word of your choice (up to 16 characters) in place of
•on the idle screen and
•(during intercom calls).
The default setting is .
1Press . The screen displays
2Press or until the screen displays
3Press . The screen displays
1 0
4Use the keypad and the ch a rt on page 27 to
enter a handset name.
5Press to save the displayed name.
To change the name again at any time,simply repeat
Steps 1-5.
Language Setting
You can set each registered handset so the display
appears in English, Spanish,or French. The default
setting is .
1Press . The screen displays
2Press or until the screen displays
3Press . The screen displays the current
language
4Press or to scroll through the
language choices.
5Press to save the displayed language.
The display will show in the language you have
selected.
1 1
Clear Message Wa i t i n g
If you subscribe to telephone company voice mail
service,and the message waiting indicator remains
on even after you have reviewed all messages,follow
the directions below to turn off the indicator.
NOTE: These steps will clear the message waiting
¥
indicator for ALL registeredhandsets (See “About
Adding Handsets”on page 2 for details about
additional handsets.)
1Press . The screen displays
2Press or until the screen displays
3Press . The screen displays
1 2
4Press to confirm and remove the message
waiting indicator
— OR —
Press to exit the menu without clearing
the message waiting indicator.
The screen returns to
Set Dial Method
NOTE: When you change the dial method setting
¥
ALL registered handsets are affected. (See “About
Adding Handsets”on page 2 for details about
additional handsets.)
This phone comes set for touch tone () dialing.
If you have dial pulse (rotary) service,you must set
the dial method to .
1Press . The screen displays
2Press or until the screen displays
3Press . The screen displays
4Press or to select
— OR —
Press or to select .
5Press to save the displayed setting.
1 3
TELEPHONE OPERATION
Idle Screen
When the handset is within range of the base and not
on a call or in Feature Setup mode,the screen displays
If you assign a name to the handset (see “Handset
Name”on page 10),that name will be displayed
instead of .
Make a Call
1Press ,then dial the number
— OR —
Dial the number,then press .
2To end the call,press again
— OR —
Place the handset in the base.
Answer a Call
1Press to answer a call.
2To end the call,press again
— OR —
Place the handset in the base.
1 4
Handset Volume
You can adjust the volume of what you hear through
the handset during a conversation by pressing
VOLUME or VOLUME . While you adjust the
volume level,the screen display is similar to
NOTE: You will hear 3 short beeps when you
¥
have reached the minimum or maximum levels
of volume.
Call Timer
When the handset is on a call,the screen displays a
timer whether the call is external or intercom.
For example:
Speakerphone
When the handset speakerphone is activated,you can
use the phone hands-free. Stand the handset on a flat
surface (not in the base) and continue your
conversation.
Make a Call
1Press ,then dial the number
— OR —
Dial the number,then press .
2To end the call,press again
— OR —
Place the handset in the base.
Answer a Call
1Press to answer a call.
2To end the call,press again
— OR —
Place the handset in the base.
Switch Between Handset and Speakerphone
While on a call you can press to switch to
speakerphone. While on a speakerphone call,press
to return to the handset.
1 5
Redial
The last five phone numbers dialed at the handset
are stored in redial memory.
Press repeatedly until the number you want to
call is displayed,then press to dial the displayed
number
— OR —
Press ,then press repeatedly until the
number you want to call is displayed. Press to
dial the displayed number.
Flash/Call Waiting
If you subscribe to Call Waiting service with your local
telephone service provider,you can answer a new
incoming call without losing your current call.
1Press to connect to the new call when
you receive a call-waiting signal.
2Press again to return to the original call.
NOTE: Use to access other phone
¥
company subscriber services, as described
by your provider.
1 6
M u t e
1D u ring a telephone conve rs a t i o n ,mu t e
the handset microphone by pressing .
The other party will be unable to hear any t h i n g
on your end. The screen is similar to
2To return to two-way conversation,press
again.
Page/Handset Locator
NOTE: If you have installed additional AT & T
¥
2300 handsets (purchased sep a ra t e ly) with yo u r
2320 base, p ressing will signal A L L
re gi s t e red handsets.
Page the handset(s) from the base by pre s s i n g
. The handset will sound a re p e a t i n g
t o n e .
To cancel the page press any key on the handset,or
on the base,or wait 60 seconds.
Te m p o r a ry Tone Dialing
If you have dial pulse (rotary) service,you can change
from dial pulse to touch tone dialing during a call.
1Make the call,and wait until it is connected.
2P re s s. Keys pressed after this send touch
tone signals.
3After you hang up,the phone automatically
re t u rns to dial pulse (ro t a ry) serv i c e .
1 7
DISPLAY SCREEN MESSAGES
SCREEN DISPLAYS:WHEN:
You have an incoming phone call
(without Caller ID).
You have an incoming intercom call.
The screen also shows the calling
location (for example,).
This handset is not registered to
the base.
A new uncharged battery has been
installed. Place the handset in the
base to charge the battery.
The handset battery is recharging
and may not have enough power for
normal operation yet.
The battery is low.
The phone line is disconnected.
Check the line jacks.
Another phone on this line is in use.
1 8
The handset is out of range.
You have unreviewed voice mail
messages. (You must subscribe to
Voice Mail service from your local
telephone service provider.)
DISPLAY SCREEN ICONS
THIS ICON:INDICATES:
The handset ringer is turned off.
(See “Ring Volume”on page 7
for details.)
The battery needs to be recharged.
The Caller ID information displayed
is an unreviewed call.
NEWThere are unreviewed calls in the call log.
1 9
BASE LIGHTS
LIGHT:STATUS:INDICATES:
CHARGING onHandset is in the base
charging
IN USE onHandset is on a call
IN USE flashPhone line is disconnected
IN USE fast flashHandset registration is in
progress
2 0
TONES AND WHAT THEY MEAN
TONE:INDICATES:
Three quick beepsHandset is out of range of the base
One double beepHandset has failed to register
with base
Two double beepsHandset battery charge is low
One beepHandset registration is complete
2 1
INTERCOM OPERATION
NOTE: The features in this section work only
¥
if you have installed additional AT&T 2300
Expansion Handsets with your AT&T 2320
Telephone.(See “About Adding Handsets”on
page 2 for more information.)
Intercom Calls
If you have more than one handset (AT&T 2300,
purchased separately) registered with your 2320 base,
you can make intercom calls between handsets.
1Call one handset from another by pressing
.
2Use or to scroll through the list of
registered handsets.
3Press when the desired handset is
highlighted.
4To answer,press on the second handset.
Call All
You can send an intercom call signal to all registered
handsets at once. The first handset to answer the call
will be connected.
1Press on the handset
2Use or to highlight .
3Press .
4To answer,press at another handset.
Only the first handset to respond will be
connected to the intercom call.
2 2
Answer an Incoming Call While on an
Intercom Call
If an incoming call is received while you are using the
intercom,you will hear a double beep and the screen
will display call information as usual for 15 seconds.
To answer the incoming call,press on either
handset. The intercom call is automatically ended.
To end the intercom call without answering the
incoming call,press and hold . The screen displays
Transfer a Call
If you have installed additional AT&T 2300 handsets
(purchased separately) with your 2320 telephone, you
can transfer a call from one handset to another and
announce the caller.
1Press . Your call is put on hold and the
screen displays.
2Use or to scroll through the list of
registered handsets.
3Press when the desired handset is
highlighted.
4When someone at the other handset answers
the call,announce the caller. Then press
or place the handset in the base
to complete the transfer.
— OR —
To have a conference call, pess and hold .
2 3
F o rw a rd a Call
If you have installed additional AT&T 2300 handsets
( p u rchased separa t e ly) with your 2320 telephone,yo u
can fo r wa rd a call f rom one handset to another without
announcing the caller.
1Press . Your call is put on hold and the
screen displays
2Use or to scroll through the list of
registered handsets.
3Press when the desired handset,or
is highlighted. The call will ring at the
selected handset(s),and
will be displayed.
If a fo r wa rded call is not answe red within 30 seconds,
the call will automatically be re t u rned to the fo r wa rd i n g
h a n d s e t . The screen displays or the CID
i n fo rmation (if ava i l abl e ) . If the re t u rned call is not
a n swe red within 20 seconds,the call is automatically
d i s c o n n e c t e d .
2 4
C o n f e rence Calling
1If one handset is already on a call,you can
connect a second handset to the call by
pressing on the second handset
— OR —
You can first intercom another handset by
pressing .,then when the desired
handset is highlighted. After the other handset
answers the intercom call, press and hold .
2Disconnect either or both handsets by
pressing .
2 5
PHONEBOOK
This telephone can store up to 50 telephone numbers
and names. Phone book entries a re stored in alphab e t i c a l
order. Storing a number and name in one handset
automatically stores it in ALL registered handsets. (See
“About Adding Handsets”on page 2 for details about
additional handsets.)
S t o re a Number and Name in Phone Book
1 Press . The screen displays
2Press . The screen displays
3Press . The screen displays
2 6
4Press to select . The screen displays
5Press . The screen displays
6Enter the telephone number (up to 24 digits).
7Press . The screen displays
D i a lP re s s e s
K e y123456789
1
ABC2abc
DEF3def
GHI4ghi
JKL5jkl
MNO6mno
PQRS7pqrs
TUV8tuv
WXYZ9wxyz
0
*?!/()
#’,-.&
To erase a digit or character press either(DELETE) or .
Pressingwill move the cursor one space to the right.
8Enter a name connected with this number,
using the chart below. You must store a name
with each number.
2 7
9Press . The screen returns to
— OR —
If the phone book is already full,the screen
displays
10 Begin at Step 4 to enter another telephone
number and name
— OR —
Press to exit.
2 8
Dial a Number in Phone Book
1 Press . The screen displays the first
phone book entry.
Skip to Step 5.
— OR —
Press . The screen displays
2Press . The screen displays
3Press . The screen displays
4Press . The screen displays the first phone
book entry and looks similar to
5Enter the first letter of the stored name you
want to find,then scroll using or
— OR —
P ress or to scroll through phone book entri e s .
6When you find the number you want to call,
press to dial the displayed number.
The screen display is similar to
2 9
Edit a Number/Name in Phone Book
1 Press . The screen displays the first
phone book entry.
Skip to Step 5.
— OR —
Press . The screen displays
2Press . The screen displays
3Press . The screen displays
4Press . The screen displays the first phone
book entry and looks similar to
3 0
5Enter the first letter of the stored name you
want to find,then scroll using or
— OR —
Press or to scroll through phone book
entries.
6When you find the number you want to edit,
press to enter edit number mode.
7Press (DELETE) to erase a digit
— OR —
Press and hold (DELETE) to delete
entire telephone number.
8Press to store the edited number,and
enter name mode.
9Press (DELETE) to erase a character
— OR —
Press and hold (DELETE) to delete entire
name.
10 Press to confirm the change. The screen
displays the edited entry.
11 Press ;the screen returns to
3 1
Delete a Number/Name from Phone Book
1 Press . The screen displays the first
phone book entry.
Skip to Step 5.
— OR —
Press . The screen displays
2Press . The screen displays
3Press . The screen displays
4Press . The screen displays the first phone
book entry and looks similar to
3 2
5Enter the first letter of the stored name you
want to find,then scroll using or
— OR —
P ress or to scroll through phone book entri e s .
6When you find the number you wish to
delete,press (DELETE) to delete the
entire displayed entry. The screen display is
similar to
7Press . The entry is deleted and the screen
displays the next phonebook entry.
3 3
CALLER ID OPERATION
If you subscribe to Caller ID service with your local phone service
provider, this phone stores all incoming calls with valid Caller ID
information in the call log. Name,number,time and date information
can all be stored,if they are sent with the call. Calls are automatically
stored in the order they are received,with call “1”stored as the most
recent call. The call log number appears next to the phone number on
the screen display. New (unreviewed) call information includes
in the display.
If an incoming phone number matches one already in the call log,
the old call information will be deleted when the new call information
is saved in the call log.
If an incoming phone number matches an existing phone book entry,
the caller’s name will appear in the call log as you saved it in the
phone book (not as it was sent with incoming Caller ID information).
For example
NOTE: Caller IDinformation is shared by ALL registered
¥
handsets. (See “About Adding Handsets”on page 2 for more
information.) Removing a call record from one handset also
removes it from the others.
If Caller ID information has been received you can see a summary of the
call log on the idle screen. For example if the screen displays
there are two calls in the call log,and one of them is unreviewed ().
Press at any time to exit the call log and return to the idle screen.
3 4
Review Call Log
1Press . The screen displays the most
recent call in the call log and displays if
the call is new.
Skip to Step 3.
—OR—
Press
2Press . The screen displays the most
recent call in the call log and displays if
the call is new.
3Press or to scroll through the call log.
. The screen displays
3 5
Remove Call Record s
Removing a Specific Call Record
1Press . The screen displays the most
recent call in the call log and displays if
the call is new.
Skip to Step 3.
—OR—
Press
2Press . The screen displays the most
recent call in the call log and displays if
the call is new.
. The screen displays
3 6
3Press or to scroll through the call log.
4When you find the call record you want to
remove,press and release (DELETE).
The call record is removed and the next call
record is displayed.
Remove All Call Record s
1Press . The screen displays the most
recent call in the call log and displays if
the call is new.
Skip to Step 3.
—OR—
Press
2Press . The screen displays the most
recent call in the call log and displays if
the call is new.
3Press and hold (DELETE). The screen
displays
. The screen displays
4Press to delete all call records.
The screen returns to the idle screen:
— OR —
Press to exit without deleting.
The screen returns to the last viewed record.
3 7
S t o re a Call Record in Phone Book
You can store a number re c e i ved by Caller ID in the
telephone phone book.For call re c o rds without a va l i d
name you will be prompted to enter a new name. Yo u
can fo l l ow the directions in “Edit a Number/Name in
Phone Book”on page 30 to assign a name to the
nu m b e r. A call re c o rd with no valid phone nu m b e r
cannot be stored in the phone book.
1Press . The screen displays the most
recent call in the call log and displays if
the call is new.
Skip to Step 3.
—OR—
Press . The screen displays
2Press . The screen displays the most
recent call in the call log and displays if
the call is new.
3 8
3Press or to scroll through the call log.
4When you find the call record you want to
store in the phone book,press
times.
The call record is saved in the phone
book and you can continue to review the
call log.
three
Display Dial
While you are reviewing the call log, you can dial a
number displayed on the screen.
1Press . The screen displays the most
recent call in the call log and displays if
the call is new.
Skip to Step 3.
—OR—
Press
2Press . The screen displays the most
recent call in the call log and displays if
the call is new.
. The screen displays
3Press or to scroll through the call log.
4When the phone number you want to call is
displayed,press . The phone
automatically dials the number and the screen
displays
Dialing Options
While a call record is displayed,press until the
screen displays the number the way you want to dial it.
For example:19085551212
9085551212
15551212
5551212
The number of dialing options available for each call
displayed depends on the format of the original call.
3 9
BATTERIES
Battery Life
Battery life depends on how far the handset is from the base,and other
environmental conditions.
NOTE: For optimum performance, charge your handset on the
¥
base every night.
Charge the Handset Battery Pack
•This battery should remain charged for up to three days. A fully
charged battery provides an average talk time of about seven hours.
•The battery pack needs charging when:
–The battery icon () flashes,
–A warning tone sounds,or
–The screen displays when idle.
•Place the handset in the base so the CHARGING light goes on.
The battery pack is typically charged in eight hours. For best
results,the initial charge should be 12 hours.
•You can keep the battery fully charged by returning the handset to
the base after each use.
•If you repeatedly get a low battery indicator,even after eight hours
of charging,the battery should be replaced. Use onlyAT&T Battery
3301,SKU# 91076.
4 0
CAUTION: Charge the battery provided with or identified for
use with this product only in accordance with the instructions
and limitations specified in the User’s Manual, Part 1.
Replace the Handset Battery Pack
1Install the handset battery.
Use onlyAT&T Battery 3301,SKU# 91076.
a) Remove battery
compartment cover by
pressing on indentation
and sliding downward.
b) Plug the battery pack
connector into handset.
Place the battery pack and
wires in the compartment.
c ) Replace cover by
sliding it on its
t ra ck up over batt e ry case until it
snaps fi rm ly into
p l a c e .
2Charge the handset battery.
•Place the handset in the base.
•Charge the battery for at least 12 hours. After the
first charge,the battery will charge in eight hours.
4 1
IN CASE OF DIFFICULTY
If you have difficulty operating this phone,try the suggestions below.
For Customer Service,visit our website at www.telephones.att.com
or call 1 800 222–3111. Please retain your receipt as your proof of purc h a s e.
TELEPHONE OPERATION
PROBLEM SOLUTION
If the phone does not • Make sure the power cord is plugged
work at all, check these into the base and an electrical outlet
items first:not controlled by a wall switch.
• Make sure the telephone line cord is
plugged firmly into the base unit and
the telephone jack.
• Make sure the battery pack is installed
correctly.
• If the screen displays ,
place the handset in the base and charge
for at least eight hours.
• If the battery does not charge after eight
hours,replace it with AT&T Battery
3301,SKU# 91076.
PROBLEM SOLUTION
If you have noCheck all the previous suggestions.
dial tone:If you still do not hear a dial tone,
disconnect the phone and try another
phone in the same jack. If there is
no dial tone on that phone either, the
problem is probably in your wiring or
local service.
PROBLEM SOLUTION
If you hear a two-beep The handset and base are not
signal when you try tocommunicating properly. You might
use the handset:be out of range. Move closer to the base
and try again.
4 2
TELEPHONE OPERATION
PROBLEM SOLUTION
If you hear noise or •You may be out of range. Move closer to
interference when the base.
using the phone:
• Household appliances plugged into the
same circuit as the base can sometimes
cause interference. Try moving the
appliance or the base to another outlet.
•The layout of your home or office may
be limiting the operating range. Try
moving the base to another location,
preferably on an upper floor.
• Using the handset near household
appliances (microwaves,computers,
televisions,stereos,etc.) can sometimes
cause interference. Move away from
appliances while using the handset.
PROBLEM SOLUTION
If the phone does• Make sure the ringer is on.
not ring when you• Make sure the telephone line cord is
receive a call:connected firmly to the base and the
telephone jack.
• Make sure the AC adapter is plugged
firmly into an electrical outlet not
controlled by a wall switch.
•You might be too far from the base;
move closer.
•You might have too many extension
phones on your telephone line to allow
all of them to ring. Try unplugging some
of them.
4 3
TELEPHONE OPERATION
PROBLEM SOLUTION
If your telephone• If you have dial pulse (rotary) service,
misdials:you’ll need to set the dial method to
. Follow the instructions under
“Set Dial Method”in the FEATURE SETUP
section of this manual.
• If you have touch tone service and you
hear clicks while you are dialing,you’ll
need to set the dial method to .
Follow the instructions under “Set Dial
Method”in the FEATURE SETUP section
of this manual.
PROBLEM SOLUTION
If you are unable If you have dial pulse (rotary) service,
to operate special follow the directions under “Temporary
telephone services Tone Dialing”in the TELEPHONE
or other equipment OPERATION section of this manual.
requiring touch tone
signals:
CALLER ID
PROBLEM SOLUTION
If the caller’s• Make sure you subscribe to Caller ID
name or phoneservice from your local telephone
number is not company.
displayed:• Make sure the battery is charged.
• Caller ID service might not work when
the phone is connected to a Private
Branch Exchange (PBX).
4 4
CALLER ID
PROBLEM SOLUTION
If the caller’s name•You should call your service provider
or phone number is to confirm that you subscribe to
not displayed duringcombined Caller ID with Call Waiting
Call Waiting:service.
• Caller ID information received during
Call Waiting is displayed only on the
handset that is in use. The information
is stored in the Caller ID log on ALL
registered handsets.
• Make sure the battery is charged.
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DEFAULT SETTINGS
DEFAULT SETTINGS
FUNCTION:DEFAULT SETTING:
Dial MethodTone
Handset Volume3
Ring Volume3
External Ring Pattern0
Intercom Ring Pattern 1
Key ClickON
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TECHNICAL SPECIFICATIONS
TECHNICAL SPECIFICATIONS
Frequency Range2400 MHz – 2483 MHz
Channels95
Channel Spacing864 kHz
Output Power23 dBm
Sensitivity-92 dBm
ModulationGFSK
Operating Temperature 0°C – 50°C
Base Unit Voltage 96 – 144 Vrms