Version 6.6 603 October 2014
Installation & Operation Manual 40. General SIP Configuration
Parameter
Name
Type
Provisioning
Type
Description
On Failure Initiates G.711 Transport – Initiates fax /
modem using the coder G.711 A-law/μ-
law with adaptations (see Note below).
Initiates T38 Fax Relay With G.711 On
Failure – 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 last two options):
Echo Canceller = On
Silence Compression = Off
Echo Canceller Non-Linear Processor
Mode = Off
Dynamic Jitter Buffer Minimum Delay =
40
Dynamic Jitter Buffer Optimization Factor
= 13
If the device initiates a fax session using
G.711 (for last two options) , a 'gpmd'
attribute is added to the SDP in the following
format:
For A-law: 'a=gpmd:8 vbd=yes;ecan=on'
For Mu-law: 'a=gpmd:0
vbd=yes;ecan=on'
Detect Fax on
Answer Tone
Enum
Disable, Enable
Instant Enables Detection of Fax on Answer Tone.
Enable Fax Re-
Routing
Enum
Disable, Enable
Instant Enables or disables re-routing of Tel-to-IP
calls that are identified as fax calls. If a CNG
tone is detected on the Tel side of a Tel-to-IP
call, a "FAX" prefix is appended to the
destination number before routing and
manipulations occur. Standard Tel-to-IP
routing table mechanism is then used to
route the call, and the destination number
manipulation mechanism is used to remove
the "FAX" prefix, if required. If the initial
INVITE that is used to establish the voice
call (not Fax) was already sent, a CANCEL
(if not connected yet) or a BYE (if already
connected) is sent to tear down the voice
call.
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