[SIPForum-discussion] difference between INFO and OPTIONSmethod?

[Herve Jourdain]

Hi,

 

I just would add that you can’t send the CANCEL until you receive a 1xx
response.

But once you receive it, if you do receive it, then you probably have to
generate it, in order to CANCEL the call, because then the other party would
have initiated the call handling on its side, and it probably has to be
stopped – if you wanted to send that CANCEL request, you probably had a good
reason for that


So basically, there are chances you need to deal with “deferred” CANCEL
requests, that you can’t send until you receive a 1xx response


 

It might not that easy to implement, one way could be to keep the
transaction running, and at the UAC core level, when receiving the first 1xx
notification sent by state machine to UAC core, if you determine there is no
“ongoing call” related to it, you could just then send a CANCEL request.

 

Regards,

 

Hervé

 

  _____  

From: discussion-bounces at sipforum.org
[mailto:discussion-bounces at sipforum.org] On Behalf Of Geo Paul
Sent: vendredi 7 décembre 2007 19:41
To: discussion
Subject: Re: [SIPForum-discussion] difference between INFO and
OPTIONSmethod?

 

CANCEL is send only if you receive a 100 trying and did not receive a final
response (200Ok) from the next node. So if your INVITE did not make it to
the next node then you need not a send a CANCEL. 

 

Geo 

 

  _____  

   

From: Andrea Puddu [mailto:androjoker at hotmail.com] 
Sent: Friday, December 07, 2007 1:29 PM
To: nidhi jain; discussion at sipforum.org
Subject: Re: [SIPForum-discussion] difference between INFO and OPTIONS
method? 

 

I answer to first question (correct me if I am wrong):

  CANCEL request is sent when response to INVITE message is not received. If

this INVITE request is lost and UA may still send a CANCEL request. Is this 
possible? Can CANCEL request be sent without sending an INVITE message? 

A CANCEL request can be sent if the 200 OK to the INVITE request has not
been received yet from the Caller. Otherwise you have to send a BYE request.
Furthermore I guess that if you send a CANCEL not related to an INVITE you
will probably receive a " 

481 Call/Transaction Does Not Exist" message. _In fact which Call-ID do you
mean to use? It has to be the same of the INVITE request. Just try.






 







 







 
Andrea

 

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Date: Fri, 7 Dec 2007 15:09:33 +0000
From: nidhi_jain6680 at yahoo.co.in
To: discussion at sipforum.org
Subject: [SIPForum-discussion] difference between INFO and OPTIONS method?

Hello, 

        CANCEL request is sent when response to INVITE message is not
received. If 
this INVITE request is lost and UA may still send a CANCEL request. Is this 
possible? Can CANCEL request be sent without sending an INVITE message? 

        What is the basic difference between INFO and OPTIONS method? can
OPTIONS 
used for mid-call signalling? 

        Why is ACK request required? Is it just to avoid retransmission of
response 
message. This could be done even by starting the media transmission. 

        How are DTMF digits sent before the session setup? 

Please reply. 

Thank you. 

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