Media5 Mediatrix 4104, Reference Manual

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Chapter 18 - SIP Protocol Features Interop Parameters
278 Mediatrix 4104
T.38 Negotiation Syntax
You can define the format used, in the SDP portion of SIP packets, to advertise the unit's T.38 capabilities.

To set the T.38 negotiation syntax to use:
1. In the sipInteropMIB , set the sipInteropUseItuT38Format variable with the proper behaviour.
Addressing Failed Registration Attempts
You can control whether or not failed registration attempts are retried periodically.

To address failed registration attempts:
1. In the sipInteropMIB , set the sipInteropRetryFailedRegistration variable with the proper behaviour.
SIP Domain in Request URI
You can control whether or not the request URI is built using the SIP Domain.

To use the SIP domain in the Request URI:
1. In the sipInteropMIB , set the sipInteropUseSipDomainInRequestURI variable with the proper
behaviour.
Standards Supported • ITU-T Recommendation T.38, section D.2.3
Table 180: T.38 Negotiation Syntax Usage
Parameter Description
disable Support for the boolean T.38 parameters T38FaxFillBitRemoval,
T38FaxTranscodingMMR, and T38FaxTranscodingJBIG is advertised by
associating a value of 0 (unsupported) or 1 (supported) with the parameter in the
following manner:
a=T38FaxFillBitRemoval:0
a=T38FaxTranscodingMMR:0
a=T38FaxTranscodingJBIG:0
This is the default value.
enable Support for the above T.38 parameters is advertised in conformance with ITU-T
Recommendation T.38, section D.2.3. The presence of the parameter in the SDP
indicates support for it (without the need for an associated value), while its absence
means that it is not supported.
Table 181: Failed Registration Attempts Behaviour
Parameter Description
disable No retries are performed following a failed registration attempt. Manual intervention
is required for the port to re-attempt registration.
enable A failure to register a port to the SIP Registrar triggers an automatic retry every 2
minutes.
This is the default value.
Table 182: SIP Domain in Request URI Behaviour
Parameter Description
disable The request URI is built using the home domain proxy host as defined in “Proxy
Server” on page 165 .