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Community Member

PBX to IP Telephony Migration

Initial Phase

PSTN (xx1000-xx2999 DID)->E1 R2-> PBX-> extensions (1000-2999)

Migration Phase

PSTN (xx1000-xx2999 DID)->E1 R2 -> C3845->E1 R2-> PBX -> extensions (1000-2000)

PSTN (xx1000-xx2999 DID)->E1 R2 ->C3845->GigabitEthernet->CUCM 7.0->extensions (2000-2999)

I want to migrate extensions 2000 to 2999 from PBX to IP Telephony.The PBX knows just E1 CAS R2 signalling.I put the router C3845 between PSTN and PBX but i know that CUCM 7.0 not support E1 CAS R2 signalling and is not possible to control E1 R2 interfaces on router C3845.

How i can make this migration?

Any suggestions? Any configuration example?

Thanks.

1 ACCEPTED SOLUTION

Accepted Solutions
Hall of Fame Super Gold

Re: PBX to IP Telephony Migration

Use H.323 as protocol between CUCM and GW.

That way you can use E1 R2 or whatever else.

7 REPLIES
Hall of Fame Super Gold

Re: PBX to IP Telephony Migration

Use H.323 as protocol between CUCM and GW.

That way you can use E1 R2 or whatever else.

Community Member

Re: PBX to IP Telephony Migration

This configuration is good?

CUCM 7.0 - 172.16.0.10

C3845 - 172.16.0.1

CUCM 7.0 configuration:

-configure H323 gateway (device name : 172.16.0.1)

-configure route pattern to PSTN (route pattern: 9.@, gateway: 172.16.0.1)

C3845 configuration:

isdn incoming-voice voice

#e1 r2 to PSTN

controller e1 0/0/0

ds0-group 0 timeslots 1 31 type r2 digital

#e1 r2 to PBX

controller e1 0/0/1

ds0-group 0 timeslots 1 31 type r2 digital

#dial 2000-2999

dial-peer voice 2000 voip

destination-pattern 2...

session target ipv4:172.16.0.10

codec g711ulaw

dtmf-relay h245-alphanumeric

#dial PSTN

dial-peer voice 1 pots

destination-pattern 9T

direct-inward-dial

port 0/0/0:15

#dial 1000-1999

dial-peer voice 2 pots

destination-pattern 1...

port 0/0/1:15

Hall of Fame Super Gold

Re: PBX to IP Telephony Migration

usually there is more stuff configured for R2, you should find an example for your country.

Community Member

Re: PBX to IP Telephony Migration

but except r2 configuration, what is your opinion for the rest of configuration?

Hall of Fame Super Gold

Re: PBX to IP Telephony Migration

Seems fine, on the DP for the PBX you may want to have "forward-digits all" else it doesn't get all the digits.

Also, have network-clock-select from PSTN, use clock internal to the PBX.

In any case, I recommend you hire a professional for the job, because customer get nervous very quickly with PBXs and a beginner doesn't have the time to do trial and error.

Community Member

Re: PBX to IP Telephony Migration

but except r2 configuration, what is your opinion for the rest of configuration?

Hall of Fame Super Gold

Re: PBX to IP Telephony Migration

I've answered you above.

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