B. Configuration Files
71
B.4.4
SIP Extension Parameters
SIP Extension parameters allow the ZIP2 phone to leverage advanced SIP protocol features.
Figure B-8 lists the SIP Extension configuration parameters.
Parameter
Description
Equivalent
web interface
parameter
Version
Introduced
SIP_INVITE_TIMER
Send INVITE with this Timer header value.
Default value is an empty string.
3.35
SIP_MESSAGE_WAITING
Backup SIP server proxy address value. If
primary proxy server fails to operate, ZIP2
attempts to switch to backup proxy. Valid
settings are YES and NO.
YES – subscribe to SIP message waiting
service
NO – do not subscribe to SIP message
waiting service.
Default is YES.
3.35
SIP_REXMT_INVITE
Specifies the number of unsuccessful INVITE
retransmissions before phone switches to the
backup proxy. Valid settings range from 1 to
10.
Default value is 6.
3.35
SIP_REXMT_REQUEST
Specifies number of unsuccessful
retransmissions (other than INVITE) before
phone switches to backup proxy. Valid
settings range from 1 to 11.
Default value is 10.
3.35
SIP_SEND_PRACK
Specifies whether or not to support reliable
provisional response transmission (PRACK
method support). Valid settings are YES and
NO.
YES – enable PRACK support
NO – disable PRACK support
Default value is NO.
3.35
SIP_SESSION_TIMER
Specifies SIP Session Timer Value in seconds.
Default value is empty string.
3.35
SIP_URI_USER_PARAM
Encode SIP URI with user parameter
“user=phone”. Valid settings are YES and
NO.
YES – add “user=phone” to SIP URI
NO – do not add “user=phone” to SIP URI
Default value is NO.
3.35
Figure B-8
SIP Extension Configuration Parameters
Summary of Contents for ZIP2
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