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Community Member

Dial Peer Help


Need some help in setting up dial peers for this scenario.

Telco--E1 R2---2800---E1 PRI---Nortel BCM

2800 is acting like a converter from

E1 R2 --> E1 PRI and vice versa. The Nortel does not support E1 R2.

Incoming call from PSTN originates from

R2 so i need to pass that on to the E1 PRi to reach the nortel.

Outgoing call originates from the PRI which i need to route over to the R2 to

reach the PSTN.


Hall of Fame Super Gold

Re: Dial Peer Help

Suppose nortel is receiving 4 digits od DID all beginning with 43.

dial-peer voice 1 pots

incoming called-number .


dial-peer voice 2 pots

destination-pattern 43..

port 0/x/0:15

dial-peer voice 3 pots

destination-pattern .T

port 0/x/1

Basically, that's it. You could further optimize depending on the country where you're installing this.

Hope this helps, please rate post if it does!

Community Member

Re: Dial Peer Help


The outgoing works, Nortel BCM can call

PSTN already. But I can't seem

to get incoming calls to work.

Im testing incoming calls from e1 r2, to

go to an analog phone connected to the

router via fxs.

I have attached debug and configuration of


Hall of Fame Super Gold

Re: Dial Peer Help

Ask telco if they are sending ANI and how many DID digits. Then configure dso-group and cas-custom accordingly.

Community Member

Re: Dial Peer Help

The E1 R2 is not set for DID although according to the telco they are sending

023975700 as called number for the incoming

call on all incoming channels. According to them ANI is also being sent.

Is there a way to verify this ?

Community Member

Re: Dial Peer Help

Community Member

Re: Dial Peer Help

Got this to work, apparently Telco is timing

out before it can receive the seize ack from

the router.

Below is the config for the E1 for reference

of all trying to work interconnection with

Digitel here in the Philippines. Digitel is

using ITU R2 instead of Philippine R2. And

their "seize acknowledgement timeout" I think

is set to 150ms. By default the cisco was sending its seize ack in 190ms.

controller E1 0/3/0

framing NO-CRC4

ds0-group 1 timeslots 1-5 type r2-digital r2-compelled ani

ds0-group 2 timeslots 6-10 type r2-digital r2-compelled ani

cas-custom 1

seizure-ack-time 40

cas-custom 2

Thanks for all who replied and helped.

Hall of Fame Super Gold

Re: Dial Peer Help

Yes a 120ms default would have been more reasonable. If you want to speedup calls, ask telco to not send DNIS at all.

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