Monday, May 19, 2008

To use fax with Cisco Voip

In order to use a fax system within the Cisco Voip setup (including call forwarding fax calls), you have to make sure the system can handle the fax signal without degrading or corrupting the signal.

For me, that means configuring the router to disable the Cisco fax routing.

voice service voip
fax protocol pass-through g711ulaw
modem passthrough nse codec g711ulaw

and configuring a dial-peer:

dial-peer voice 74 voip
destination-pattern 181[8-9]
modem passthrough nse codec g711ulaw
codec g711ulaw
fax rate disable
no vad

In addition, you have to set the network clock selection:

network-clock-select 1 T1 0/0/0

This is done to make sure the slip sec doesn't go above 0, which causes problems.

To view slip sec:
show controller T1

To clear the counter:
clear counter

No comments: