[cisco-voip] Nortel PBX Integration with Cisco VoIP Gateways - Question

[embeleco]

Sending for the second time.....

On 1/22/07, embeleco <embeleco at gmail.com> wrote:
>
> Hi.
>
> Currently I have Nortel PBX Option 61 connected to a Cisco VoIP Gateway
> using a T1/PRI ISDN interface to have calls to another Nortel PBX Option 61
> connected to another router using ISDN as well. Nortel PBX boxes already had
> the PSTN Connection (another T1/PRI ISDN).
>
> Now we would like to have a failover to the PSTN in case there is no
> bandwidth available on the network or for some reason the call cannot be
> completed through the IP network.
>
> 1. It is better to do the failover on the Nortel PBX using some sort of
> least cost routing (hunting) with the VoIP Trunk and the PSTN trunk and with
> the correct digit manipulation?
>
> 2. Or it is better to have the VoIP Router to hairpin the call back to the
> nortel PBX (as a new call) in order for the PBX to send the call out the
> PSTN trunk. (in this case the router will do the digit manipulation
> necessary). I know that this option will consume more DSP resources and
> channels on the T1/PRI.
>
>
> Any ideas? Suggestions?
>
> Thanks,
>
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