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

[embeleco]

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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