[cisco-voip] How can I maintain PSTN call during CCM <--> SRST mode change?

Tue Nov 11 12:28:41 EST 2008

If you disable MGCP-Fallback, the PRI should stay down until connection with the Call Agent is re-established.

Jorge

From: Wes Sisk [mailto:wsisk at cisco.com]
Sent: Tuesday, November 11, 2008 1:05 PM
To: Jorge L. Rodriguez Aguila
Cc: Damien Ball; syed.khalid.khursheed at gmail.com; James.Jung at telecom.co.nz; cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] How can I maintain PSTN call during CCM <--> SRST mode change?

what happens if you disable failback from mgcp to h.323?

/wes

On 11/10/2008 8:32 AM, Jorge L. Rodriguez Aguila wrote:

No, There is no way to maintain a Call on a PRI on an MGCP Circuit because on MGCP the Gateway is dumbed down and is managed completely by the Call Agent (CCM). when the Link between these two is severed, The System no longer "knows" how to operate the circuit since Q.931 is backhauled to the ccm and so it comes down. At that same instant H.323 "fallback" takes over and brings the circuit up again. When communication is restored the same thing happens in reverse order. If you want to Preserve call integrity during a transition from and to srst you will need to switch to H.323.

Jorge Rodríguez Aguila

CCNA,CCVP,CRMCS,CIPCES

Senior Voice/Data Network Consultant

Netxar Technologies

jorge.rodriguez at netxar.com<mailto:jorge.rodriguez at netxar.com>

Office 787-765-0058

PCS 787-688-8530

-----Original Message-----

From: cisco-voip-bounces at puck.nether.net<mailto:cisco-voip-bounces at puck.nether.net> [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Damien Ball

Sent: Monday, November 10, 2008 8:37 AM

To: syed.khalid.khursheed at gmail.com<mailto:syed.khalid.khursheed at gmail.com>; James.Jung at telecom.co.nz<mailto:James.Jung at telecom.co.nz>

Cc: cisco-voip at puck.nether.net<mailto:cisco-voip at puck.nether.net>

Subject: Re: [cisco-voip] How can I maintain PSTN call during CCM <--> SRST mode change?

Using MGCP with a PRI, can you maintain a call during failover?  I thought I read that you could not.

Damien Ball

Network Engineer

A+, CCNA, ACDT, ACTC

Granville County Schools

Technology Department

101 Delacroix St.

Oxford, NC 27565

Office:  (919) 693-4613

Fax:  (919) 693-7391

"Syed Khalid Ali" <syed.khalid.khursheed at gmail.com><mailto:syed.khalid.khursheed at gmail.com> 11/10/08 3:05 AM >>>

If using H.323 you can preserve calls on SRST fallback with the config

script below:

voice service voip

 h323

  no h225 timeout keepalive

I hope this helps.

Regards,

Khalid

On Mon, Nov 10, 2008 at 10:22 AM, James Jung <James.Jung at telecom.co.nz><mailto:James.Jung at telecom.co.nz> wrote:

Hi all,

I tested call during registered to CCM and shutdown the WAN. After some

time, the router went into SRST and the call disconnected.

Also, during the SRST mode, when the WAN link came up, the call

disconnected.

How can I maintain PSTN call during CCM <--> SRST mode change?

JamesJ.

_______________________________________________

cisco-voip mailing list

cisco-voip at puck.nether.net<mailto:cisco-voip at puck.nether.net>

https://puck.nether.net/mailman/listinfo/cisco-voip

_______________________________________________

cisco-voip mailing list

cisco-voip at puck.nether.net<mailto:cisco-voip at puck.nether.net>

https://puck.nether.net/mailman/listinfo/cisco-voip

***************************************************************************************************

The Granville County School System does not discriminate on the basis of race, color, national origin, gender, disability, religion, or age in its programs or activities. If you have an inquiry regarding the nondiscrimination policies, please contact: Assistant Superintendent for Human Resources and Operations Granville County Schools, Oxford, North Carolina 27565, 919-693-4613. http://www.gcs.k12.nc.us

_______________________________________________

cisco-voip mailing list

cisco-voip at puck.nether.net<mailto:cisco-voip at puck.nether.net>

https://puck.nether.net/mailman/listinfo/cisco-voip

_______________________________________________

cisco-voip mailing list

cisco-voip at puck.nether.net<mailto:cisco-voip at puck.nether.net>

https://puck.nether.net/mailman/listinfo/cisco-voip

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://puck.nether.net/pipermail/cisco-voip/attachments/20081111/28559d3a/attachment-0001.html>