AudioCodes Mediant 500 E-SBC, User Manual

Page: 310 / 920

User's Manual 310 Document #: LTRT-10437
Mediant 500 E-SBC
Parameter Description
key.
Jitter Buffer Max Delay
CLI: jitter-buffer-max-delay
[IpProfile_JitterBufMaxDelay] Defines the maximum delay and length (in msec) of the Jitter
Buffer.
The valid range is 150 to 2,000. The default is 250.
GW
Web: Coders Group ID
CLI: coders-group-id
[IpProfile_CodersGroupID] Defines coders supported by this SIP entity, by assigning a
Coders Group.
The value, Default Coders Group represents the coders
configured in the Coders table (see Configuring Coders on
page
297 ). All other optional values (e.g., Coders Group 1),
represent the coders defined for the specific Coder Group
configured in the Coder Group Settings table (see
Configuring Coder Groups on page
300 ).
Web: Fax Signaling Method
CLI: fax-sig-method
[IpProfile_IsFaxUsed] Defines the SIP signaling method for establishing and
transmitting a fax session when the device detects a fax.

[0] No Fax = (Default) No fax negotiation using SIP
signaling. The fax transport method is according to the
FaxTransportMode parameter.

[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/

-law with adaptations (see
the Note below).
Notes:

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

If the device initiates a fax session using G.711 (option 2
or 3), 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'

When this parameter is set to 1, 2, or 3, the parameter
FaxTransportMode is ignored.

When this parameter is set to 0, 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.

For more information on fax transport methods, see
Fax/Modem Transport Modes on page
159 .

The corresponding global parameter is IsFaxUsed.