Voice PRI config examples

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Feb 14th, 2009
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I need help. I am trying to bring a voice PRI up on a 2811 under MGCP control. I am running UCM 6.1

I cannot get this PRI to pass calls at all, of course this is my first attempt at doing anything other than an FXO on a gateway.

Any help would be greatly appreciated.

controller T1 0/3/1

framing esf

linecode b8zs

cablelength long 0db

pri-group timeslots 1-24 service mgcp


interface Serial0/3/1:23

no ip address

encapsulation ppp

isdn switch-type primary-ni

isdn protocol-emulate network

isdn incoming-voice voice

isdn bind-l3 ccm-manager


dial-peer voice 1 pots

service mgcpapp

destination-pattern 9...........

port 0/3/1:23

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paolo bevilacqua Sat, 02/14/2009 - 08:34
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Begin checking "show controllers T1".

Also consider,an H.323 would be simpler and gives you more features and flexibility.

In any case you also need

network-clock-participate wic 3

network-clock-select 1 t1 0/3/1

Chris Deren Sat, 02/14/2009 - 09:21
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Did you configure the GW properly in CallManager, does it show registered?

Few commands to look at on the gW:

"sh controller t1" - will show you layer one connectivity

"sh isdn status" - will show you L2 ISDN status, you are looking for multiple_frames_establisher here

"sh ccm-manager" - will show you registration status with CM

if all of these pass, then I would look at CM configuration for misconfiguration, i.e. wrong CSS applied to the GW, wrong number of significant digits, etc

For outbound calls you need to ensure your GW is defined in RG--> RL --> Route Pattern that is accessible from the calling device (phone) via proper Calling Search space/partition configuration.



Anonymous (not verified) Sat, 02/14/2009 - 10:51
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Well I gave up on MCCP and went H323 and it started passing calls.

Isdn status is good

The show controller does indicate continued slip secs though.

I can call outbound now and it is great. I am having trouble with my inbound peers though, I dial in to the first DID and I just get dialtone.

I need to figure out how to tie those DID's from the PSTN to my internal DN's.

Oh and happy Valentines day by the way.


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