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

[Wes Sisk]

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
> 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] On Behalf Of Damien Ball
> Sent: Monday, November 10, 2008 8:37 AM
> To: syed.khalid.khursheed at gmail.com; James.Jung at telecom.co.nz
> Cc: 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> 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> 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.
>>
>>
>>
>>
>>
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>>
>>     
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