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List Info
Thread: Signalling and media path of SIP
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| Signalling and media path of SIP |
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2006-11-29 13:10:51 |
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Hello, ; Recently I read from an article that signalling path of SIP is different from the path of media. When two end points want to communicate using SIP, the signalling takes place according to the operation of SIP, but once the signalling is over and when the media channel has to be established, which protocol is used to find the optimal media path? ; Moreover, when the session has to be terminated, SIP enabled end point has to send the BYE request, in this case, whether it takes the same path of INVITE request(which initiated the session) or a different one. I am considering the stateless proxies to be in the network. with regards Raj. 2;
Everyone is raving about the all-new Yahoo! Mail beta. |
| Signalling and media path of SIP |
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2006-11-29 15:54:46 |
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Questions like this are addressed to
SIP-Implementors mailing list.
sip-implementors cs.columbia.edu">sip-implementorscs.columbia.edu.
You may want to see some IETF example call
flows.
In addition to RFC 3261, please refer to RFC
3665 and other BCPs on SIP.
To answer the question, the media could be
RTP based. The media path are between the two UAs.
The call signaling could be established
where multiple SIP servers could be involved. If the SIP servers needs to
be in the signaling path for the duration of the call, then the Servers do
Record-Route. ; So, a BYE or any other requests will visit the SIP
servers. If the SIP servers do not wish to be in the path for subsequent
requests, it will not record-route.
-----Original Message-----
From: sip-bouncesietf.org
[mailto:sip-bouncesietf.org] On Behalf Of Raj
Sent: Wednesday,
November 29, 2006 7:11 AM
To: SIP forum
Subject: [Sip] Signalling and
media path of SIP
;
Recently I read from an article that signalling path of SIP is different from
the path of media. When two end points want to communicate using SIP, the
signalling takes place according to the operation of SIP, but once the
signalling is over and when the media channel has to be established, which
protocol is used to find the optimal media path?
; Moreover,
when the session has to be terminated, SIP enabled end point has to send the
BYE request, in this case, whether it takes the same path of INVITE
request(which initiated the session) or a different one. I am considering
the stateless proxies to be in the network.
Everyone is raving about the
all-new Yahoo! Mail beta.
|
| Signalling and media path of SIP |
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2006-11-30 13:26:58 |
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Hi Raj,
For first problem, I don't think there is any protocol to find out the
optimal Media Path. The SDP contact address which they share in INVITE
and 200 OK will be used for Media transmission.
For second, If you want to send BYE in the same path where your
previous packets traversed you should have enabled Record-Route at the
proxy servers. Else BYE will go directly to the contact address which ;
came in 200 OK of INVITE(at UAC) and ACK(at UAS).
Regards
Vinod Kagalkar
Senior Project Leader
MultiTech Software Systems
Bangalore
Raj wrote:
web52913.mail.yahoo.com"
type="cite">
Hello,
Recently I read from an article that signalling path of SIP is different from the path of media. When two end points want to communicate using SIP, the signalling takes place according to the operation of SIP, but once the signalling is over and when the media channel has to be established, which protocol is used to find the optimal media path?
Moreover, when the session has to be terminated, SIP enabled end point has to send the BYE request, in this case, whether it takes the same path of INVITE request(which initiated the session) or a different one. I am considering the stateless proxies to be in the network.
with regards
Raj.
---------------------------------
Everyone is raving about the all-new Yahoo! Mail beta.
_______________________________________________
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cs.columbia.edu">Sip-implementorscs.columbia.edu
https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
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| Signalling and media path of SIP |
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2006-11-30 03:28:22 |
SDP (session description protocol) information carried in
the message
body of the SIP messages(usually INVITE and its 200 OK
response)
exchanged b/w the two endpoints, explains the terminal
capabilities of
an endpoint to its peer. This SDP also includes the IP
address and UDP
port that will be used for the media packet flow. So once
the signaling
is through, flow of media packets is end to end.
Once the dialog is established, two endpoints communicate
directly
through the URI received in the contact headers. Hence, the
bye request
is sent directly end to end bypassing any proxy.
Raj wrote:
> Hello,
>
> Recently I read from an article that
signalling path of SIP is different from the path of media.
When two end points want to communicate using SIP, the
signalling takes place according to the operation of SIP,
but once the signalling is over and when the media channel
has to be established, which protocol is used to find the
optimal media path?
>
> Moreover, when the session has to be
terminated, SIP enabled end point has to send the BYE
request, in this case, whether it takes the same path of
INVITE request(which initiated the session) or a different
one. I am considering the stateless proxies to be in the
network.
>
> with regards
> Raj.
>
>
> ---------------------------------
> Everyone is raving about the all-new Yahoo! Mail beta.
> _______________________________________________
> Sip-implementors mailing list
> Sip-implementorscs.columbia.edu
> https://lists.cs.columbia.edu/cucslists/listinf
o/sip-implementors
>
>
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