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T-Lib-Initiated Hold-Retrieve


SIP Server's Hold operation can be configured to play music while the customer is placed on hold by an agent. The music-on-hold configuration is global — if it is enabled, all held parties hear music; if it is not enabled, all held parties hear silence.

Hold-with-silence only involves stopping the RTP streams. The Retrieve operation resumes the RTP streams.

There are multiple methods for stopping the RTP streams. SIP Server uses IP address in the c= attribute as the only universally accepted method.

Because some endpoints may change the RTP port address when trying to retrieve a call, the re-INVITE with delayed SDP offer-answer negotiation shown in the following diagram is necessary.


SIP Endpoint SDK T-Lib-Initiated Hold-Retrieve.jpg

This page was last edited on August 19, 2016, at 19:28.
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