[cisco-voip] AS5300 Media address

[Wes Sisk]

I believe the NAT device in your scenario is not performing fixup.  NAT 
involves rewriting not only the IP header but also fixing up the message 
body to rewrite embedded IPs and ports.  This may involve dynamic port 
allocation as well.  It is generally referred to as 'protocol fixup' on 
the NAT device.

/Wes

On Tuesday, April 06, 2010 12:15:15 PM, David Eco <david.eco at msn.com> wrote:
> Hello,
> I tried to send the SIP call to AS5350 from a IP PBX but got one way 
> audio.
> The scenario is SIP phone ->NAT->IP PBX -> AS5350 ->T1 circuit.
> When the call reached AS5350, it came with private IP address and sent 
> the RTP back to it instead of public IP's.
> Is there any way to set the media address as the IP's in FROM which 
> means sending the media back to the origination, IP PBX? Thank you.
>
>  
>
> ======Debug output=======
> (x.y.z.a=AS5350   x.y.z.b=IP PBX)
>
> Apr  6 14:15:23.866: //-1/xxxxxxxxxxxx/SIP/Msg/ccsipDisplayMsg:
> Received:
> INVITE sip:8411647 at x.y.z.a SIP/2.0
> Call-ID: 6a34022c7c7a0d2c6234438c553eceb2 at 172.16.1.179 
> <mailto:6a34022c7c7a0d2c6234438c553eceb2 at 172.16.1.179>
> CSeq: 2 INVITE
> From: <sip:test01 at x.y.z.b>;tag=e002bb19cef9ffdee832
> To: <sip:8411647 at x.y.z.a>
> Via: SIP/2.0/UDP x.y.z.b:5061;branch=z9hG4bk-e002bb19cef9ffdee832
> Max-Forwards: 70
> Allow: INVITE,CANCEL,ACK,BYE,NOTIFY,REFER,OPTIONS,INFO,MESSAGE,UPDATE
> Contact: <sip:ippbx at x.y.z.b:5061>
> Supported: replaces
> Content-Type: application/sdp
> Content-Length: 339
>
> v=0
> o=CMI-SIPUA 63439 0 IN IP4 172.16.1.179
> s=SIP CALL
> c=IN IP4 172.16.1.179
> t=0 0
> m=audio 60000 RTP/AVP 0 8 4 18 23 22 2 21 101
> a=rtpmap:23 G726-16/8000
> a=rtpmap:22 G726-24/8000
> a=rtpmap:2 G726-32/8000
> a=rtpmap:21 G726-40/8000
> a=rtpmap:101 telephone-event/8000
> a=fmtp:101 0-15
> a=fmtp:18 annexb=no
> a=rtcp:60001
> a=sendrecv
>
>  
>
>           Stream type            : voice-only
>           Media line             : 1
>           State                  : STREAM_ADDING (2)
>           Callid                 : -1
>           Negotiated Codec       : g711ulaw, bytes :160
>           Negotiated DTMF relay  : inband-voice
>           Negotiated NTE payload : 0
>           Negotiated CN payload  : 0
>           Media Srce Addr/Port   : x.y.z.a
>           Media Dest Addr/Port   : 172.16.1.179:44042
>  
>  
>
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