Re-writing RFC 3605 SDP attributes

Hi All,

In this example I have a Aastra 9480i phone at 10.1.0.244. I have a
siproxd instance running on a machine that straddles the 10.1.0
internal network and 64.60.XX.YY public IP address.

I have an asterisk server that also happens to be running on the same
public IP address (for now). I am using sipproxd so that handsets can
bypass Asterisk for their RTP streams negotiate directly with the
other endpoint.

Take a look at the extracted SDP packet below. This was captured on
the outbound side of siproxd, between siproxd and the Asterisk server.
You can see that it's rewritten most of the packet perfectly. The only
problem is that the handset has included RFC 3605 RTCP attributes, and
these have not been rewritten by siproxd.

I can't find a way to stop my handsets setting this attribute, so it
would be great if siproxd could rewrite it.

Thanks

Darrin



    Message Body
        Session Description Protocol
            Session Description Protocol Version (v): 0
            Owner/Creator, Session Id (o): MxSIP 0 1 IN IP4 64.60.XX.YY
                Owner Username: MxSIP
                Session ID: 0
                Session Version: 1
                Owner Network Type: IN
                Owner Address Type: IP4
                Owner Address: 64.60.XX.YY
            Session Name (s): SIP Call
            Connection Information (c): IN IP4 64.60.XX.YY
                Connection Network Type: IN
                Connection Address Type: IP4
                Connection Address: 64.60.XX.YY
            Time Description, active time (t): 0 0
                Session Start Time: 0
                Session Stop Time: 0
            Media Description, name and address (m): audio 17114
RTP/AVP 9 18 107 113 110 111 96 106 0 8 101
                Media Type: audio
                Media Port: 17114
                Media Proto: RTP/AVP
                Media Format: ITU-T G.722
                Media Format: ITU-T G.729
                Media Format: 107
                Media Format: 113
                Media Format: 110
                Media Format: 111
                Media Format: 96
                Media Format: 106
                Media Format: ITU-T G.711 PCMU
                Media Format: ITU-T G.711 PCMA
                Media Format: 101
            Media Attribute (a): rtpmap:9 G722/8000
                Media Attribute Fieldname: rtpmap
                Media Format: 9
                MIME Type: G722
            Media Attribute (a): rtpmap:18 G729/8000
                Media Attribute Fieldname: rtpmap
                Media Format: 18
                MIME Type: G729
            Media Attribute (a): rtpmap:107 BV32/16000
                Media Attribute Fieldname: rtpmap
                Media Format: 107
                MIME Type: BV32
            Media Attribute (a): rtpmap:113 L16/16000
                Media Attribute Fieldname: rtpmap
                Media Format: 113
                MIME Type: L16
            Media Attribute (a): rtpmap:110 PCMU/16000
                Media Attribute Fieldname: rtpmap
                Media Format: 110
                MIME Type: PCMU
            Media Attribute (a): rtpmap:111 PCMA/16000
                Media Attribute Fieldname: rtpmap
                Media Format: 111
                MIME Type: PCMA
            Media Attribute (a): rtpmap:96 G726-40/8000
                Media Attribute Fieldname: rtpmap
                Media Format: 96
                MIME Type: G726-40
            Media Attribute (a): rtpmap:106 BV16/8000
                Media Attribute Fieldname: rtpmap
                Media Format: 106
                MIME Type: BV16
            Media Attribute (a): rtpmap:0 PCMU/8000
                Media Attribute Fieldname: rtpmap
                Media Format: 0
                MIME Type: PCMU
            Media Attribute (a): rtpmap:8 PCMA/8000
                Media Attribute Fieldname: rtpmap
                Media Format: 8
                MIME Type: PCMA
            Media Attribute (a): rtpmap:101 telephone-event/8000
                Media Attribute Fieldname: rtpmap
                Media Format: 101
                MIME Type: telephone-event
            Media Attribute (a): silenceSupp:on - - - -
                Media Attribute Fieldname: silenceSupp
                Media Attribute Value: on - - - -
            Media Attribute (a): fmtp:101 0-15
                Media Attribute Fieldname: fmtp
                Media Format: 101 [telephone-event]
                Media format specific parameters: 0-15
            Media Attribute (a): ptime:30
                Media Attribute Fieldname: ptime
                Media Attribute Value: 30
            Media Attribute (a): rtcp:3001 IN IP4 10.1.0.244
                Media Attribute Fieldname: rtcp
                Media Attribute Value: 3001 IN IP4 10.1.0.244
            Media Attribute (a): sendrecv

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