[SIPForum-discussion] Inhibit Early media

Doug Sauder doug.sauder at dsauder.com
Wed Jan 27 22:07:19 UTC 2010

The UAC can set the send/receive attribute to sendonly.  For example:

        o=7035553001 8000 8000 IN IP4
        s=SIP Call
        c=IN IP4
        t=0 0
        m=audio 5004 RTP/AVP 0
        a=rtpmap:0 PCMU/8000


Paulo Moura Guedes wrote:
> Hi,
> When a UAS receives an INVITE containing the SDP from UAC, the RFC
> says that the UAS can start transmitting media packets to the UAC,
> even if the UAC didn't receive any 18x response.
> Is there any (standard) way to inform UAS to not send early media?
> Thanks in advance,
> Paulo Moura Guedes
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