[SIPForum-discussion] Call Hold , How to validate during call Hold our session is alive?

[Abhisek Acharya]

Hi Sonu,

Let us assume you put a call on hold.UAC sends a RE-INVITE with modified
sdp body and UAS replies with a 200 OK and call goes on a hold.The only way
to identify if the session is alive or not is the Session-Refresher
mechanism which is widely used to check the session integrity.This is a way
where mid-dialog refresher requests will go to just verify if the seeion is
alive or not.For example a UPDATE message with a session-Expiry
header,Min-SE and refrehsre header which in turn will be acknowledged by
the UAS.


Few parameters like Supported:timer in the initial INVITE and Require:timer
in the 200 OK response is mandatory to kick-off the Sessio-Refresher
mechanism.Please let me know if you have any problem in this.

Regards
Abhisek Acharya
GSLAB,PUNE



On Sun, Sep 9, 2012 at 12:44 PM, Sonu Kumar <amit.chhikara at hotmail.com>wrote:

>  Hi All,
>
> During a Call Hold how to validate or check whether our session is alive
> or not.
>
> I know media flow will be unidirectional, Is really media will be
> flowing unidirectional during call hold.
>
> what parameter we can check to validate session is alive or not during
> call hold.
>
>
> Thanks & Regards,
> Sonu
>
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