[Users] keep alive using RE-INVITE

[Javier Ramirez]

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 at voice-system.ro>
  >     *To:* Javier Ramirez <mailto:jvr_78 at yahoo.com.ar>
  >     *Cc:* users at openser.org <mailto:users at 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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  >     > 
  >     >
  >
  >
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