Version 6.2 701 February 2011
SIP User's Manual 12. Configuration Parameters Reference
Parameter Description
Web/EMS: Session
Expires Method
[SessionExpiresMethod]
Determines the SIP method used for session-timer updates.
[0] Re-INVITE = Uses Re-INVITE messages for session-timer
updates (default).
[1] UPDATE = Uses UPDATE messages.
Notes:
The device can receive session-timer refreshes using both methods.
The UPDATE message used for session-timer is excluded from the
SDP body.
[RemoveToTagInFailureR
esponse]
Determines whether the device removes the ‘to’ header tag from final
SIP failure responses to INVITE transactions.
[0] = Do not remove tag (default).
[1] = Remove tag.
[EnableRTCPAttribute]
Enables or disables the use of the 'rtcp' attribute in the outgoing SDP.
[0] = Disable (default)
[1] = Enable
EMS: Options User Part
[OPTIONSUserPart]
Defines the user part value of the Request-URI for outgoing SIP
OPTIONS requests. If no value is configured, the endpoint number
(analog interfaces) or configuration parameter ‘Username’ value (digital
interfaces) is used.
A special value is ‘empty’, indicating that no user part in the Request-
URI (host part only) is used.
The valid range is a 30-character string. The default value is an empty
string (‘’).
Web: Fax Signaling
Method
EMS: Fax Used
[IsFaxUsed]
Determines the SIP signaling method for establishing and transmitting a
fax session after a fax is detected.
[0] No Fax = No fax negotiation using SIP signaling. Fax transport
method is according to the parameter FaxTransportMode (default).
[1] T.38 Relay = Initiates T.38 fax relay.
[2] G.711 Transport = Initiates fax/modem using the coder G.711 A-
law/Mu-law with adaptations (see Note below).
[3] Fax Fallback = Initiates T.38 fax relay. If the T.38 negotiation
fails, the device re-initiates a fax session using the coder G.711 A-
law/μ-law with adaptations (see the Note below).
Notes:
Fax adaptations (for options 2 and 3):
9 Echo Canceller = On
9 Silence Compression = Off
9 Echo Canceller Non-Linear Processor Mode = Off
9 Dynamic Jitter Buffer Minimum Delay = 40
9 Dynamic Jitter Buffer Optimization Factor = 13
If the device initiates a fax session using G.711 (option 2 and
possibly 3), a 'gpmd' attribute is added to the SDP in the following
format:
9 For A-law: 'a=gpmd:8 vbd=yes;ecan=on'
9 For μ-law: 'a=gpmd:0 vbd=yes;ecan=on'
When this parameter is set to 1, 2, or 3, the parameter
FaxTransportMode is ignored.
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