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

Mon Nov 29 12:32:46 EST 2010

OCS/Lync always needs a mediation server for PSTN connectivity. With Lync 2010 if you implement media bypass (use G711 directly to client) you still need a mediation server for call signaling. If you are getting disconnects you should run the Logger tool and look at the SIP messages traversing between UCM and the mediation server.  Hopefully this helps.

From: cisco-voip-bounces at puck.nether.net [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Buchanan, James
Sent: Monday, November 29, 2010 10:18 AM
To: Ahmed Maher; 'Ahmed Elnagar'; 'Bill'; 'Sechaba Mokoena'
Cc: cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] Outbound Calls from OCS to Cisco IP Phone

http://nathanwinters.co.uk/2010/09/28/can-lync-send-audiomedia-direct-to-the-pstn-using-g-711/ is an article I have found on this subject re: the need for the mediation server.

Thanks,

James Buchanan | Technology Manager, UC | South Region | Presidio Networked Solutions
12 Cadillac Dr, Suite 130, Brentwood, TN 37027 | jbuchanan at presidio.com<mailto:jbuchanan at ctiusa.com>
D: 615-866-5729 | F: 615-866-5781 | www.presidio.com<http://www.presidio.com/>
CCIE #25863, Voice

From: cisco-voip-bounces at puck.nether.net [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Ahmed Maher
Sent: Monday, November 29, 2010 11:00 AM
To: 'Ahmed Elnagar'; 'Bill'; 'Sechaba Mokoena'
Cc: cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] Outbound Calls from OCS to Cisco IP Phone

Do u have MTP Checked in the SIP Trunk and what is the preferred codec for MTP?

Best Regards,

   [Connect Logo copy]

       Ahmed Maher
Networking Team Leader               CONNECT  Professional Services
          CCIE #23844                           Bldg. 1A Maadi Star Towers, Cornish El Maadi,
[specialist_sm][ccie_voice_sm]             Cairo, Egypt
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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 4:19 PM
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)
 [Description: ccie_voice_large.gif]

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)
 [Description: ccie_voice_large.gif]

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)
 [Description: ccie_voice_large.gif]

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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