-----Original Message----- From: mayank@in.niksun.com [mailto:mayank@in.niksun.com] Sent: Friday, 19 September 2008 5:28 PM
...
- In H225/Q931 what could be the error codes. Is these error codes
comes along with the last message "Release complete message" ?
Yes.
are in between the call.
What do you mean by this?
Can error message comes in between the call signaling ?
I am able to find these kind of codes specifically in SIP with the response messages with their numbers(Ex:400,500,..),similarly the case with the MGCP protocol.But,I am very much confused with the H.323.
Look at Q.850
2)What could be the case with the H.245 protocol.
No, as I said before, this is not in H.245. There is just endSession and it has no Q.931 information in it.
Robert Jongbloed OPAL/OpenH323/PTLib Architect and Co-founder.
Mayank,
What do you mean by this?
Can error message comes in between the call signaling ?
There really are no H.225.0 Call Signaling error "messages", though there are error codes in Release Complete. Those may or may not indicate an "error" -- they could indicate normal call termination. There are several places where error responses messages might be used in RAS (communication with the Gatekeeper)
I am able to find these kind of codes specifically in SIP with the response messages with their numbers(Ex:400,500,..),similarly the case with the MGCP protocol.But,I am very much confused with the H.323.
In SIP, the 5xx messages means the server could not process your request. This might be due to the fact that the server failed or that the message was garbage. H.323 devices would generally just send a Release Complete with an appropriate Q.850 Cause Code. 4xx is similar, but indicates a different nature to the problem -- again, there are equivalent Q.850 cause codes. 3xx is different -- that is a redirection. H.323 devices will do that, too, but the procedure is different. Send a SETUP to a device and it might return a FACILITY message with the "Reason" field set to "callForwarded". That's the same as a 3xx. The calling H.323 device sends a Release Complete and then places a new call to the new destination. 2xx means things were processed normally. We do not need an error code for normal operations. SIP does that because it was a hack of HTTP, which is a client/server request/response system. H.323 is not a request/response system, so it works differently.
Look at Q.850
2)What could be the case with the H.245 protocol.
No, as I said before, this is not in H.245. There is just endSession
and it
has no Q.931 information in it.
H.245 does have error messages, such as "functionNotUnderstood". Otherwise, there aren't any and there really is no need. H.245 does have rejection messages (like OpenLogicalChannelReject) that includes a reason for why the OLC is rejected.
I hope that helps.
Paul Jones www.packetizer.com
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mayank＠in.niksun.com -
Paul E. Jones