E1 interface configuration

Unanswered Question
Aug 15th, 2007

Good Day to All,

Can someone assist me a configuration on how to provision a E1/PRI interface on my Cisco 3825,this E1 is directly connected to nortel PBX via E1 also.

Here is my simple network diagram;

Cisco 3825 E1/PRI interface <---twistedpair---->E1card nortel pbx.

Thank you and best regards,

Lester

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graemeporter Wed, 08/15/2007 - 23:31

Hi Lester,

EDIT: I'm assuming you're going to use your 3825 as a VoIP gateway router. If not, then I've just gone off on a tangent... :)

First you need to set your card type - the 2MFT-T1/E1 WIC is dual mode and works on both E1 (European) and T1 (US) ISDN30 types. Type:

card type e1 0 0

(The two 0s represent the physical port that your WIC is in)

Now you'll need to set the clock participation, so you'll need to enter this:

network-clock-participate wic 0

network-clock-select 1 E1 0/0/0

Now you need to set up the controllers. Before you do this, you NEED to know how many timeslots (channels) you have bought on your ISDN30 line. In my example, we bought 25, and we're using the router as a voice gateway (sits between the ISDN30 E1 line (E1 0/0/0) and a PBX (E1 0/0/1)).

controller E1 0/0/0

pri-group timeslots 1-25

description Interface to PSTN

!

controller E1 0/0/1

clock source internal

pri-group timeslots 1-25

description Interface to PBX

The router will then create lots of serial interfaces, for each timeslot you have specified (this is why you need to enter the right number of timeslots).

Next, we need to set up the signalling channel (which is always the 16th channel, or 15 because the router counts this from 0):

interface Serial0/0/0:15

no ip address

encapsulation hdlc

no logging event link-status

no snmp trap link-status

isdn switch-type primary-net5

isdn incoming-voice voice

isdn bchan-number-order ascending

no cdp enable

!

interface Serial0/0/1:15

no ip address

encapsulation hdlc

no logging event link-status

no snmp trap link-status

isdn switch-type primary-net5

isdn overlap-receiving T302 5000

isdn protocol-emulate network

isdn incoming-voice voice

no cdp enable

!

Finally, you'll need to create dial peers to enable the router to pass calls between the outside and the inside. For this, you need to know your DID ranges; you may need to speak to your telecoms provider to see how many digits you are presented with by the exchange.

This dial peer should allow anyone on the PBX to dial out :-

dial-peer voice 101 pots

description E1 PRI to PSTN

destination-pattern .T

progress_ind setup enable 3

progress_ind alert enable 8

progress_ind progress enable 8

progress_ind connect enable 8

incoming called-number .

fax rate fax

no digit-strip

direct-inward-dial

port 0/0/0:15

!

You'll need to create dial peers like this but for "port 0/0/1:15" to allow inbound dialling. Your "destination-pattern" is what defines which calls the router passes inward.

If you're using VoIP for Cisco Unified CallManager, then you'll want to set up some VoIP dial peers as well, to point your inbound calls to the CallManager cluster.

Hope this is of some help!

Kind regards,

Graeme

Paolo Bevilacqua Thu, 08/16/2007 - 02:09

To Add to good info give by Graemeporter, watch out about the commands:

progress_ind setup enable 3

progress_ind alert enable 8

progress_ind progress enable 8

progress_ind connect enable 8

these are not necessary unless proved otherwise.

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