[SIPForum-discussion] Issue in sending ACK

[Banda, Srinivas (Srinivas)]

Hi Deepak,

Due to all above , UA B will retransmit the 200OK and will set the timer this time to 1 sec and it will go on . Total of 7   200 OK (.5 sec, 1 sec, 2 sec, 4 sec, 8 sec, 16 sec, 32 sec). If still no response , UA B will send the cancel message.

I feel UA B will send the BYE message not the CANCEL.

Regards
Srinivas


From: discussion-bounces at sipforum.org [mailto:discussion-bounces at sipforum.org] On Behalf Of Deepak Rawat
Sent: Thursday, March 28, 2013 11:24 PM
To: satya r; discussion at sipforum.org
Subject: Re: [SIPForum-discussion] Issue in sending ACK

Hi Satya,

Step 1    A-----Invite------------>B
Step 2    A<----180 ring---------B
Step 3    A<-----200 OK---------B
Step 4    A---------X---------------B


Now if the ACK was not sent by A to B, UA B will think about it's 200OK which he sent to A at step 3. The time when UA B sent the 200OK, he set's the timer to 0.5 sec and waited for .5 sec.
Since no response in the form of ACK from A,

UA B will think either his 200 OK lost somewhere in the network

OR

UA A received my 200 OK but UA A is not responding back

OR

UA  A did sent the ACK , but probably ACK lost somewhere .

Due to all above , UA B will retransmit the 200OK and will set the timer this time to 1 sec and it will go on . Total of 7   200 OK (.5 sec, 1 sec, 2 sec, 4 sec, 8 sec, 16 sec, 32 sec). If still no response , UA B will send the cancel message.

Step 1 A-----Invite------------>B
Step 2 A<----180 ring---------B
Step 3 A<-----200 OK---------B   .5 sec
Step 4 A---------X---------------B
Step 5 A <-------200OK--------B 1.0 sec
Step 6 A ->------X---------------B
Step 7 A <--------200 OK------B 2 sec





Regards,
Deepak Rawat
________________________________
Date: Tue, 26 Mar 2013 15:10:25 +0530
From: rsatya568 at gmail.com
To: discussion at sipforum.org
Subject: [SIPForum-discussion] Issue in sending ACK
Hi All,
Let A is sending invite to B then B will send 180 ringing ,200 OK but A will not sending ACK so
Is voice path will establish in between A and B ?
so what will happen if A will not sending ACK ?
whats the problem of A why A is not sending ACK ?


Regards
satya

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