Hello all,

I have come accross some issue while using nathelper and rtpproxy. The senario is as follows:

An INVITE is sent to a NATed client and rtpproxy is used. force_rtp_proxy() rewrites the SDP to something like

c=IN IP4 213.5.43.4.
m=audio 35034 RTP/AVP 18 100 101.

The client replies 486 Busy and the script sends the request to an Asterisk which is used for voicemail. If force_rtp_proxy() is called a second time before sending to Asterisk then the result is a SDP with the following.

c=IN IP4 213.5.43.4213.5.43.4.
m=audio 3503435034 RTP/AVP 18 100 101.

Obviously this can be avoided if I add the proper logic in the script to avoid the second call to force_rtp_proxy(). However this behaviour looks like a bug.

As a second question, when the call goes to Asterisk, there is no need for rtpproxy. So how can someone revert the SDP to its original form? How do you usually handle this case?

thank you in advance

George

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