World's Simplest VWIC T1 Config?

hypnotoad

Can somebody please tell me what I'm doing wrong here -- attempting to make a call from a phone on R1 to a phone on R2. Doesn't get much simpler than that. They're connected by an MFT1 T1 with a T1 crossover. There are no alarms. I have been trying to force some combination of FXO and FXS connection for a while now without luck.


R1
tdm clock T1 3/0 voice export line
voice-card 3
controller T1 3/0
framing esf
linecode b8zs
ds0-group 0 timeslots 1-2 type fxo-loop-start
ds0-group 1 timeslots 3-4 type fxs-loop-start

voice-port 3/0:0
output attenuation 0
!
voice-port 3/0:1
output attenuation 0
!
!
dial-peer voice 2 pots
destination-pattern 1...
port 3/0:0
!
!


R2
tdm clock T1 3/0 voice export line
voice-card 2
!
voice-card 3
!
controller T1 3/0
framing esf
linecode b8zs
ds0-group 0 timeslots 1-2 type fxo-loop-start
ds0-group 1 timeslots 3-10 type fxo-loop-start
!
!
!
!
!
voice-port 3/0:0
output attenuation 0
!
voice-port 3/0:1
output attenuation 0
!
!
dial-peer voice 55 pots
description to other
preference 1
destination-pattern 2...
port 3/0:0

azaghul

Hi,

Looks like you're using 1760's (a great entry level voice router!) and there are a number of areas to look at.

Both R1 and R2 are set to receive clocking. You'll need to set one side as network to supply clock. The 1700 series has a very unintuitive method of clocking.

Set one side to;

tdm clock T1 3/0 voice import onboard internal

this will take clock from the on-board internal router clock (PLL) and import it into the VWIC card. Look for a doc at Cisco called "Clock Configuration for Cisco 1751/1760 Routers" which explains it fairly well.

DS0 group 1 has a mismatch on the number of timeslots allocated between the R1 and R2. There is also a mismatch in FXS/FXO signalling between them.

There is also a missing dial peer to process incoming calls for each router, something like;

dial-peer voice 1 pots
 desc *** Inbound Matching ***
 incoming called-number .
 direct-inward-dial
 exit

This should get you headed in the right direction.

An FYI, if you decide to change from CAS to PRI, you'll need to move the T1's to WIC/VWIC 0 or 1, it's just another oddity of the 1760.:)