Re: [Users] keep alive using RE-INVITE

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@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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