Media5 Mediatrix 4104, Reference Manual, Page: 302 / 466

Chapter 18 - SIP Protocol Features Interop Parameters
280 Mediatrix 4104

To use the payload type found in the answer:
1. In the sipInteropMIB , set the sipInteropUseDtmfPayloadTypeFoundInAnswer variable with the
proper behaviour.
This variable only has an effect when the voiceIfDtmfTransport variable is set to outOfBandUsingRtp (see
“DTMF Transport Type” on page 235 for more details). The payload type is used symmetrically meaning that
it is used to send and receive the DTMF. Use the variable sipInteropAllowAsymmetricDtmfPayloadType to
allow asymmetric payload type (see “Asymmetric DTMF Payload Type” on page 280 for more details).
Asymmetric DTMF Payload Type
The default behaviour when receiving an answer to an offer that contained an RFC 2833 payload type is to
use that payload type symmetrically (to send and receive DTMF). You can set the Mediatrix 4104 to rather use
the payload type that was placed in the initial offer to receive DTMF but still use the one in the response to
send them.

To use the asymmetric DTMF payload type:
1. In the sipInteropMIB , set the sipInteropAllowAsymmetricDtmfPayloadType variable with the proper
behaviour.
The variable does not affect the behaviour when receiving an offer. It only has an effect when the
variable
sipInteropUseDtmfPayloadTypeFoundInAnswer is set to enable (see “Using the Payload
Type Found in the Answer” on page 279 for more details).
Controlling the Call Waiting Tone via SIP INFO
The Mediatrix 4104 supports receiving some Call Waiting control commands via the SIP INFO method.
Currently, the only supported content-type is “application/broadsoft”.
The controlled call waiting tone is played through the telephony interface.

To control the call waiting tone via SIP INFO:
1. In the sipInteropMIB , set the sipInteropCallWaitingToneControlViaSipInfo variable with the proper
behaviour.
Table 185: Payload Type in Answer
Parameter Description
disable Keep using the initial payload type. This is the default value.
enable Use the RFC 2833 payload type found in the received answer
Table 186: Asymmetric DTMF Payload Type
Parameter Description
disable Use the RFC 2833 payload type found in the received answer to receive DTMF.
This is the default value.
enable Keep using the initial payload type to receive DTMF.
Table 187: Call Waiting Tone Control
Parameter Description
disable The application rejects the SIP INFO with the content type 'application/broadsoft'.
This is the default value.
enable SIP INFO with the content type 'application/broadsoft' is accepted and the call
waiting tone is started or stopped according to the body. The INFO method is also
included in the 'Allow' SIP header.