[SIPForum-discussion] SDP Message in SIP problem. Please Help.

[Kristine Regis]

Hi,

I got your point and this is the my update SDP Message:
v=0
o=root 3457731677 3457731677 IN IP4 172.16.100.21
s=-
c=IN IP4 172.16.100.21
t=0 0
m=audio 5060 RTP/AVP 0 8 101
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15

But then there's still no streaming of voice. Fo I have to configure 
something so that I can here the callee or the caller's voice? Is the 
SDP the only thing that must be modified for voice in call in sip? I am 
a beginner in this field that is why I really need help. Thank you very 
much..

Vijay Tiwari wrote:
> Hello Regis
>
> after looking into SDP, I found that you do not define dynamic payload 
> 101 you have to define dynamic payload like following
>
> a= fmtp:101 0-15 "its mandatory to define dynamic payload"
>  
>
>
>
> On Sat, Jul 25, 2009 at 7:08 AM, Kristine Regis <kristine at racequeen.ph 
> <mailto:kristine at racequeen.ph>> wrote:
>
>     Hi, I hope anyone could help me figure out what's the problem here.
>
>     I am currently developing a SIP Call. The flow of the call from INVITE
>     to BYE is correct, as I assume since the server accepted it - the
>     server
>     is OpenSIPs. My SDP is as follows:
>
>     v=0
>     o=root 3457409648 3457409648 IN IP4 172.16.100.21
>     s=-
>     c=IN IP4 172.16.100.21
>     t=0 0
>     m=audio 5060 RTP/AVP 0 8 101
>     a=rtpmap:0 PCMU/8000
>     a=rtpmap:8 PCMA/8000
>
>
>     I have this SDP and the voice streaming cannot be done. The caller and
>     the call cannot here each other. I don't know what is the problem here
>     or if the SDP above is wrong.
>
>     I hope you could help me solve this problem. Thank you.
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>
> -- 
> They can because they think they can.
>

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