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Cisco SIP IP Phone Administrator Guide
Chapter 3 Managing Cisco SIP IP Phones
Modifying the Phone’s SIP Settings
Table 3-6
Additional SIP Configuration Parameters
Parameter
Required or Optional
Messages URI
Optional
Number to call to check voice mail. This number is called when the
Messages key is pressed.
Preferred Codec
Optional
Codec to use when initiating a call. Valid values are g711alaw, g711ulaw,
and g729a. The default is g711ulaw.
Out of Band DTMF
Optional
Whether to detect and generate the out-of-band signaling (for tone
detection on the IP side of a gateway) and if so, when. The Cisco SIP IP
phone supports out-of-bound signaling via the AVT tone method. Valid
values are:
•
none—Do not generate DTMF digits out-of-band.
•
avt—If requested by the remote side, generate DTMF digits
out-of-band (and disable in-band DTMF signaling); otherwise, do not
generate DTMF digits out-of-band.
•
avt_always—Always generate DTMF digits out-of-band. This option
disables in-band DTMF signaling.
The default is avt.
Register with Proxy
Optional
Whether the phone must register with a proxy server during initialization.
Valid values are Yes and No. Select the No soft key to disable registration
during initialization. Select the Yes soft key to enable registration during
initialization. The default is No. After a phone has initialized and
registered with a proxy server, changing the value of this parameter to No
unregisters the phone from the proxy server. To reinitiate a registration,
change the value of this parameter back to Yes.
Note
If you enable registration, and authentication is required, you must
specify values for the Authentication Name and Authentication
Password parameters.
Register Expires
Optional
The amount of time, in seconds, after which a REGISTRATION request
expires. This value is used the Expire header field. The valid value is any
positive number; however, Cisco recommends 3600 seconds. The default
is 3600.
TFTP Directory
Required if
phone-specific
configuration files are
located in a
subdirectory
Path to the TFTP subdirectory in which phone-specific configuration files
are stored.
Phone Label
Optional
Label to display on the top status line of the LCD. This field is for
end-user display only. For example, a phone’s label can display “John
Doe’s phone.” Up to 11 characters can be used when specifying the phone
label.
Enable VAD
Optional
Specifies whether VAD is enabled or disabled.
VoIP Control Port
Optional
The UDP port used for SIP messages. Default is 5060. All SIP
REQUESTS use voip_control_port as the UDP source port when
nat_enable = 1. Valid values are 1025 to 65535.
