Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

FAX ISDN QSIG H323 E1 to E1 problem

Hello,

My solution is based on a Cisco 2821 Voice Gateway with two E1 interfaces (One connecting the PSTN and one for old PBX Ericsson). All my FAX machines are connected to old PBX and calls initiated from both sides works fine.

My problem is with FAX machines that can not receive or send faxes. They answer the calls, the send a short fax ton (40ms from debug), but the sending of the pages ends with "Error on Tx" message.

Can you give me a hint?

Here are my configuration parameters:

!

interface Serial0/1/0:15

description -- ERICSSON --

no ip address

encapsulation hdlc

isdn switch-type primary-qsig

isdn protocol-emulate network

isdn incoming-voice modem

no cdp enable

!

interface Serial0/1/1:15

description -- RTC --

no ip address

encapsulation hdlc

isdn switch-type primary-qsig

isdn incoming-voice modem

no cdp enable

!

dial-peer voice 108 pots

description -- to PSTN --

destination-pattern .T

fax rate voice

direct-inward-dial

port 0/1/1:15

forward-digits all

!

dial-peer voice 3 pots

description -- ERICSSON --

destination-pattern 20444..

fax rate voice

direct-inward-dial

port 0/1/0:15

forward-digits all

!

Thank you,

Dan

1 ACCEPTED SOLUTION

Accepted Solutions
Hall of Fame Super Gold

Re: FAX ISDN QSIG H323 E1 to E1 problem

Hi, likely you have not configured "network-clock-select 1 e1 0/1/1" so controller E1 is getting slips. Also check that controller E1 going to PBX should have clock source internal.

Note that the E1 going to PSTN should have switch-type primary-net5, although even qsign doen't make any difference in practice.

Hope this helps, please rate post if it does!

5 REPLIES
Hall of Fame Super Gold

Re: FAX ISDN QSIG H323 E1 to E1 problem

Hi, likely you have not configured "network-clock-select 1 e1 0/1/1" so controller E1 is getting slips. Also check that controller E1 going to PBX should have clock source internal.

Note that the E1 going to PSTN should have switch-type primary-net5, although even qsign doen't make any difference in practice.

Hope this helps, please rate post if it does!

New Member

Re: FAX ISDN QSIG H323 E1 to E1 problem

Hi,

and thank you for your answer and yours advises. I put the commands recommended by you, but this not helped. Can you tell what others think I missed making the faxes message to not be sent.

Many thanks.

Hall of Fame Super Gold

Re: FAX ISDN QSIG H323 E1 to E1 problem

Please send output of "show network-clocks" and "show controllers E1".

New Member

Re: FAX ISDN QSIG H323 E1 to E1 problem

Hi,

I retake the teste and, after your commands, all works fine.

Thank you a lot,

Dan

Hall of Fame Super Gold

Re: FAX ISDN QSIG H323 E1 to E1 problem

Very good, thanks for the appreciation and good luck!

315
Views
0
Helpful
5
Replies