Re: [Users] keep alive using RE-INVITE - sr-users

21 Jun 2006

Bogdan, I don't understand how to make this with openser.
but I understand the keepalive mechanism
can you help me?
best regards
Javier Ramirez

  ----- Original Message ----- 
  From: Bogdan-Andrei Iancu 
  To: Javier Ramirez 
  Sent: Wednesday, June 21, 2006 1:35 PM
  Subject: Re: [Users] keep alive using RE-INVITE

  Javier,

  I guess the RFC3261 or google (SIP + reINVITE) are the best source for 
  looking into.

  regards,
  bogdan

  Javier Ramirez wrote:

...
  Bogdan,
 I read that a lot of person use the RE-INVITE to keepalive the call
 but I don´t understand this.
 please, can you help me ?
 best regards
 Javier Ramirez

     ----- Original Message -----
     *From:* Bogdan-Andrei Iancu <mailto:bogdan@voice-system.ro>
     *To:* Javier Ramirez <mailto:jvr_78@yahoo.com.ar>
     *Cc:* users(a)openser.org <mailto:users@openser.org>
     *Sent:* Thursday, June 08, 2006 7:14 AM
     *Subject:* Re: [Users] keep alive using RE-INVITE

     Hi Javier,

     this is quite impossible to do - by sending re-INVITEs from a middle
     point, you will break the CSEQ consistency between the end points.
     Within the dialog, the cseq must increase from message to message
     - if
     you send a re-invite to point A with cseq n+1, after a while point
     B may
     sent a request with the same cseq since it was not aware that some
     party
     in the middle changed the number.

     the best way to do it is if you have a end2end keepalive mechanism as
     Session-Timer.

     regards,
     bogdan

     Javier Ramirez wrote:

  Hi !
 I looking for a mechanism to keep alive, and I see that is used the
 RE-INVITE, but
 How to use the Re-INVITE to a keep alive mechanism ?
 exist another way to implement another keep alive mechanism ?

 best regards
 Javier ramirez

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