unidirectional channel on a MGCP-controlled PRI

[Gianstefano Monni]

Hello,

I have a E1 interface on a 2951 MGCP gateway.

I have setup a fractional PRI, but I need to enforce some channel "direction":

- ch 1-5: inbound

- ch 6-10: bidirectional

- ch 11-15: outbound

- ch 16: signaling

I have setup the fractional pri in this way:

on the 2951:

controller E1 0/0/0

framing NO-CRC4

pri-group timeslots 6-16 service mgcp

trunk-group 1 timeslots 6-15

on the cucm

Service Parameter -> Advanced

Change B-Channel Maintenance Status 1 =

S0/SU0/DS1-0@ues-mgw02 = 0000 0000 0000 0000 1111 1111 1111 1111

but in this way I am not able to get inbound calls coming from first 5 channels....

Does any1 know how to setup such a configuration using a mgcp gateway ??

[acampbell]

Hi,

If you change to an H323 gateway your trunk group commands will work.

!

trunk group INBOUND

!

!

trunk group OUTBOUND

!

!

controller E1 1/0/0

pri-group timeslots 1-16

trunk-group INBOUND timeslots 1-5

trunk-group OUTBOUND timeslots 6-15

description *** ISDN for PSTN  ***

!

!

!

dial-peer voice 9 pots

description *** O/G LEVEL 9 TRAFFIC TO PSTN ***

destination-pattern 9T

tone ringback alert-no-PI

progress_ind setup enable 3

progress_ind alert enable 8

progress_ind progress enable 8

progress_ind connect enable 8

direct-inward-dial

trunkgoup OUBOUND

!

You cannot control the timeslot selection from the PSTN service provider

But at least you will not send calls out on 1 - 5

HTH

Alex

[Gianstefano Monni]

Hi

thx 4 ut help but I'd prefere to keep the MGCP configuration... and  I was wondering if such a setup could work:

controller E1 0/0/0

framing NO-CRC4

pri-group timeslots 1-16 service mgcp

trunk-group 1 timeslots 1-5

trunk-group 2 timeslots 6-10

trunk-group 3 timeslots 11-15

trunk-group 1

max-calls voice 5 direction in

max-calls voice 0 direction out

trunk-group 2

max-calls voice 5 direction in

max-calls voice 5 direction out

trunk-group 3

max-calls voice 0 direction in

max-calls voice 5 direction out

We're in a sensible environment so I have not applied this configuration, and I'm going to test it during night hours but i'd like to know your opinion...

[acampbell]

Hi,

My understanding re MGCP.

When you bind the the service of the E1 to MGCP the PRI is

backhauled therefore any commands that you invoke re

the controller and the serial "D" channel are ignored until the

MGCP service fails and you fall-over to SRST for example.

You can only try.

If it does not work then you will need to cosider moving to

H323 or SIP.

Regards

Alex

[Gianstefano Monni]

I see: so each and every command about trunk-group etc etc will be ignored by design because of the MGCP "behaviour"...

I should consider configuring a H323 gateway but this will be a "major" change in the setup.
Anyway, thanks a lot for your help

G.