[cisco-voip] Outbound Calls from OCS to Cisco IP Phone

Mon Nov 1 10:44:57 EDT 2010

Not with OCS.  The media path will never be directly from the IP phone to a MOC client directly.  It will always traverse the Mediation Server.  What it will do, however, is in certain cases G711 will pass through un-transcoded.  You can see this in mediation server traces and client traces.

From: Bill [mailto:bill at hitechconnection.net]
Sent: Monday, November 01, 2010 10:38 AM
To: Matt Slaga (US); 'Ahmed Elnagar'; 'Sechaba Mokoena'
Cc: cisco-voip at puck.nether.net
Subject: RE: [cisco-voip] Outbound Calls from OCS to Cisco IP Phone

Yes but I don't think the voice terminates on the mediation server anymore. The RTP G.711 call is directly between the MOC client and the Cisco IP phone once the call is setup.

Before it was MOC RTaudio to the mediation server and G.711 IP phone to the mediation server.

________________________________
From: Matt Slaga (US) [mailto:Matt.Slaga at us.didata.com]
Sent: Monday, November 01, 2010 9:34 AM
To: Bill; 'Ahmed Elnagar'; 'Sechaba Mokoena'
Cc: cisco-voip at puck.nether.net
Subject: RE: [cisco-voip] Outbound Calls from OCS to Cisco IP Phone

You absolutely need a mediation server (although in Lync it is part of the front end now) to integrate to UCM.  The mediation server handles the signaling and converts not just the codec (if necessary, it can allow G711 passthrough), but also SIP or SIP/TLS to SIP/MTLS.

From: cisco-voip-bounces at puck.nether.net [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Bill
Sent: Monday, November 01, 2010 10:18 AM
To: 'Ahmed Elnagar'; 'Sechaba Mokoena'
Cc: cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] Outbound Calls from OCS to Cisco IP Phone

It's what the Microsoft reps told us during our discussion on Lync / CUCM integration.

________________________________
From: Ahmed Elnagar [mailto:ahmed_elnagar at rayacorp.com]
Sent: Monday, November 01, 2010 9:19 AM
To: Bill; Sechaba Mokoena
Cc: cisco-voip at puck.nether.net
Subject: RE: [cisco-voip] Outbound Calls from OCS to Cisco IP Phone

Yes it was a session for an intro to Lync...maybe I will review the recorded session again if you got the information from  a solid source "maybe I miss-understand something in the session".

 Best Regards;
  Ahmed Elnagar
  Senior Network PS Engineer
  Mob: +2019-0016211
  CCIE#24697 (Voice)
 [cid:image001.jpg at 01CB79B1.63FCDF40]

From: Bill [mailto:bill at hitechconnection.net]
Sent: Monday, November 01, 2010 4:13 PM
To: Ahmed Elnagar; 'Sechaba Mokoena'
Cc: cisco-voip at puck.nether.net
Subject: RE: [cisco-voip] Outbound Calls from OCS to Cisco IP Phone

What version are you talking about? 2010 / Lync can use G.711 without a mediation server.

________________________________
From: Ahmed Elnagar [mailto:ahmed_elnagar at rayacorp.com]
Sent: Monday, November 01, 2010 9:14 AM
To: Bill; Sechaba Mokoena
Cc: cisco-voip at puck.nether.net
Subject: RE: [cisco-voip] Outbound Calls from OCS to Cisco IP Phone

This is new to me really...I had the below statement from a MS consultant "their only supported codec is RT-Audio and you need a mediation server whenever you need to integrate OCS with the outside world!!!"

 Best Regards;
  Ahmed Elnagar
  Senior Network PS Engineer
  Mob: +2019-0016211
  CCIE#24697 (Voice)
 [cid:image001.jpg at 01CB79B1.63FCDF40]

From: Bill [mailto:bill at hitechconnection.net]
Sent: Monday, November 01, 2010 3:52 PM
To: Ahmed Elnagar; 'Sechaba Mokoena'
Cc: cisco-voip at puck.nether.net
Subject: RE: [cisco-voip] Outbound Calls from OCS to Cisco IP Phone

The MOC clients can communicate using G.711 without the need of a mediation server but you have to configure them to do so.

________________________________
From: cisco-voip-bounces at puck.nether.net [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Ahmed Elnagar
Sent: Monday, November 01, 2010 8:42 AM
To: Sechaba Mokoena
Cc: cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] Outbound Calls from OCS to Cisco IP Phone

I think you will need a MS mediation server "as per Microsoft design" in order to convert their codec "RT-Audio" to a codec that Cisco infrastructure can understand.

 Best Regards;
  Ahmed Elnagar
  Senior Network PS Engineer
  Mob: +2019-0016211
  CCIE#24697 (Voice)
 [cid:image001.jpg at 01CB79B1.63FCDF40]

From: cisco-voip-bounces at puck.nether.net [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Sechaba Mokoena
Sent: Monday, November 01, 2010 3:11 PM
To: cisco-voip at puck.nether.net
Subject: [cisco-voip] Outbound Calls from OCS to Cisco IP Phone

Hi,

We're in the middle of a Microsoft OCS POC integrated with UCM 8.0. I can make internal and external calls from OCS using UCM as my gateway, but calls are dropped as soon as they're answered. Has anyone out there come across a similar problem.

Kind regards,

Sechaba Mokoena

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