AudioCodes Mediapack mp-11x, User Manual

Page: 73 / 390

Version 5.2 73 August 2007
SIP User's Manual 5. Web-based Management
Table 5-8: General Parameters (Protocol Definition)
Parameter Description
Fax Signaling Method
[IsFaxUsed]
Determines the SIP signaling method used to establish and convey a fax
session after a fax is detected.
ƒ
[0]
No Fax = No fax negotiation using SIP signaling. Fax transport
method is according to the parameter FaxTransportMode (default).
ƒ
[1]
T.38 Relay = Initiates T.38 fax relay.
ƒ
[2]
G.711 Transport = Initiates fax / modem using the coder G.711 A-
law/
µ
-law with adaptations (refer to Note below).
ƒ
[3]
Fax Fallback = Initiates T.38 fax relay. If the T.38 negotiation fails,
the gateway re-initiates a fax session using the coder G.711 A-law/
µ
-
law with adaptations (refer to Note below).
Notes:
ƒ
Fax adaptations (for options 2 and 3):
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
ƒ
If the gateway initiates a fax session using G.711 (option 2 and possibly
3), a 'gpmd' attribute is added to the SDP in the following format: For A-
law: 'a=gpmd:0 vbd=yes;ecan=on'.
For
µ
-law: 'a=gpmd:8 vbd=yes;ecan=on'.
ƒ
When IsFaxUsed is set to 1, 2, or 3 the parameter FaxTransportMode
is ignored.
ƒ
When the value of IsFaxUsed is other than 1, T.38 might still be used
without the control protocol's involvement. To completely disable T.38,
set FaxTransportMode to a value other than 1.
ƒ
For detailed information on fax transport methods, refer to 'Fax/Modem
Transport Modes' on page
325 .
Detect Fax on Answer
Tone
[DetFaxOnAnswerTone]
ƒ
[0]
Initiate T.38 on Preamble = Terminating fax gateway initiates T.38
session on receiving HDLC preamble signal from fax (default)
ƒ
[1]
Initiate T.38 on CED = Terminating fax gateway initiates T.38
session on receiving CED answer tone from fax.
Note:
This parameters is applicable only if IsFaxUsed = 1.
SIP Transport Type
[SIPTransportType]
Determines the
default
transport layer used for outgoing SIP calls initiated
by the gateway.
Valid options include:
ƒ
[0]
UDP (default)
ƒ
[1]
TCP
ƒ
[2]
TLS (SIPS)
Note:
It's recommended to use TLS to communicate with a SIP Proxy and
not for direct gateway-gateway communication.
SIP UDP Local Port
[LocalSIPPort]
Local UDP port used to receive SIP messages.
The valid range is 1 to 65534. The default value is 5060.