[Users] One way audio problem (Urgent)

Bogdan-Andrei Iancu bogdan at voice-system.ro
Wed Apr 11 10:35:23 CEST 2007

Hi Kum,

have you checked if the IPs/ports in SDP are correct and if there is any 
RTP traffic for them? Run this check on the NAT device where A&C&D are 


kyneoh at dallab.com wrote:
> Hello all,
> Ive been having a problem i cant seem to figure out, and i can see from
> various Google and list searches that i havent been the only one having
> this, but havent been able to find a solution yet for more than 3 weeks.
> Ive a bit frustrate to solve current problem.
> Ive got 4 UAs here. User agent A & C & D are located under WLAN, and user
> agent B located in the same LAN as SIP server and STUN server.
> User agent A & C connected to a restricted NAT that used STUN server to
> discover its own public IP.
> User agent A & C are mobile phone. (OS : window mobile 5.0)
> User agent D is softphone install in laptop. (OS : window XP)
> When calls gets sent from Box A to Box C (remote) i get a problem with the
> one-way audio(incoming caller can hear my voice, but i cant hear them).
> While, calls from Box A to Box D was successful.
> Both calls are form the same structure, how come calls work on A to D ???
>          (D)
>           |
> (A)-----[NAT]-----------[NAT]---------------[SIP Proxy]-----(B)
>           |               |
>          (C)         [STUN server]
> *** SIP server and STUN server have assigned different public IP adress.
> SIP server : OPENSER + RTP Proxy in OPENSUSE Linux.
> Box A, C : Ageet softphone.
> Box B ,D  : X-Lite softphone.
> Hope some of you out there are able to help me out a bit, its getting a
> bit annoying not being able to hear people calling me.
> Regards,
> Kum
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