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PBX performs tandem swithching between VoIP and VoFR

Hi,

I've got the following configuration:

SCENARIO

1751V=voip=2600 A=vofr=2600 B

Note: we have PBX connected to 2600 A and B routers through two E&M ports.

LIMITATIONS

Regargind our service provider we can not apply cRTP on frame-relay pvc, cause we have "encapsulation frame-relay IEFT". In that case we apply VoFR that works fine.

Separately VoIP is applied on leased line between 1751V and 2600 A.

POSSIBLE SOLUTION

PBX tandem switching could be a solution that way:

1751V=voip=2600 A [2 ports e&m PBX A connected]=voip=2600 B= [PBX B]=PBX phones.

THE PROBLEM

At this moment we must perform calls between 1751 fxs phone and 2600 B pbx phones.

CONFIGURATIONs

!--Router A (voip)

!

dial-peer voice 30 pots

destination-pattern 30

port 2/0

!

dial-peer voice 999 voip

destination-pattern 1511.

session target serial0/0 20

!

dial-peer voice 20 voip

destination-pattern 2.

session target ipv4:192.168.93.187

!

!--End router A.

!--Router B (connected to voip/vofr tandem switching PBX)

!

dial-peer voice 30 voip

destination-pattern 3.

session target ipv4:192.168.93.186

!

dial-peer voice 20 vofr

destination-pattern 1.

session target Serial0/0 20

!

dial-peer voice 51 pots

destination-pattern 1511.

port 1/0/0

prefix ,511

!

dial-peer voice 99 pots

destination-pattern 2.

port 1/0/1

prefix ,2

!--End router tandem.

!--Router B (vofr)

!

dial-peer voice 20 pots

destination-pattern 1.

port 1/0/0

prefix ,,1

!

dial-peer voice 10 vofr

destination-pattern 2.

session target Serial0/0 20

!

dial-peer voice 30 voip

destination-pattern 30

session target Serial0/0 20

!--End router B.

NOTES

Extensions:

ROUTER A = 30

PBX TANDEM = 1X

REMOTE PBX = 2X

"51" is the e&m trunk access digit from PBX.

At this moment calls from 1751 through 2600 B do not arrive. Calls get in PBX (connected to 2600 A router) and use the two e&m pbx ports, but the call did not switch to VoFR and do not arrive to remote PBX B.

RESOURCES

I've founded information regarding router tandem swithching, but I need information about pbx tandem switching VoIP/VoFr calls.

Does anybody been involved in a similar case? CCO only provides configuration examples about router tandem switching configuration.

I have opened a TAC case but no useful information is answered.

Thanks and regards

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