[SIPForum-discussion] Session Refresher - RFC 4028

[Sam Cao]

Gasca,

 

What you care is Video Conference solution, I think. If it is correct, MCU
(Multi-Control Unit) is central unit as mixer and trans-coding. So, based on
my understanding, it is MCU who will resent RE-INVITE message which can be
used as KEEP-ALIVE. I am working on Video Conference and Security and
Protection network, and wish some expert to make it clear.

 

Thanks,

 

Sam

 

From: discussion-bounces at sipforum.org
[mailto:discussion-bounces at sipforum.org] On Behalf Of GASCA, GONZALO
Sent: Tuesday, January 29, 2013 8:03 AM
To: discussion at sipforum.org
Subject: [SIPForum-discussion] Session Refresher - RFC 4028

 

I have the following call:

 

SIP Phone (UAC) dials to a SIP MCU (UAS)

 

UAC à UAS

 

UAS answers 200 OK including:

                Line 119: <Line Value="Session-Expires: 1800;refresher=uas">

 

After call is established, UAS sends a RE-INVITE refresher=uac in the
RE-INVITE message:

 

                Line 723: <Line Value="Session-Expires: 1800;refresher=uac">

                Line 931: <Line Value="Session-Expires: 1800;refresher=uac">

                Line 1059: <Line Value="Session-Expires:
1800;refresher=uac">

                Line 1267: <Line Value="Session-Expires:
1800;refresher=uac">


Question:

For this REINVITE message is UAS (SIP MCU) now the “new” uac or it is just
indicating that original uac (SIP Phone) should send session refresh INVITE?

 

This is not clear as SIP MCU is the one continuously sending SIP REINVITEs.

 

Thanks

 

 

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