AudioCodes MP-124 - Page 254

SIP User's Manual 254 Document #: LTRT-65412
MP-11x & MP-124
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.
[RemoveToTagInFailureResponse]
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
 [1] = Enable (default)
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 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/μ-law with adaptations (refer to 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
(refer to 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: