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2811 H323 FXS Callmanager FAX configuration


I have a branch router that has an ISDN PRI  as its main line and

a couple of FXS cards.  The main location has our Call Manager. We have a FAX maching plugged into one of the  FXS ports at the branch location. Our 4 digit extensions match the last 4 digits of their DID.

What is the best way to configure this fax machine to send and recieve calls both internal as well as external? And use its DID to the PSTN. I would rather not use MGCP.


11 Replies 11

Brandon Buffin

Assuming you have dial peers configured now, the fax can use these dial peer to make outbound calls. You can make the FXS port dialable internally by giving it an extension:

dial-peer voice 1 pots

destination-pattern 100

port 0/0/0

You can then use a voice translation rule to translate the DID to this extension for inbound calls.

Hope this helps.


Hi Many thanks for reply.

Please find error i'm getting.



Sounds like you may not have voice features in the IOS version you are running. Can you post "show version"?



Please find the 

Cisco IOS Software, 2800 Software (C2800NM-ADVSECURITYK9-M), Version 12.4(3a), RELEASE SOFTWARE (fc2)
Technical Support:
Copyright (c) 1986-2005 by Cisco Systems, Inc.
Compiled Fri 30-Sep-05 13:24 by hqluong

ROM: System Bootstrap, Version 12.3(8r)T7, RELEASE SOFTWARE (fc1)

dldsipgw uptime is 22 hours, 39 minutes
System returned to ROM by reload at 15:20:22 UTC Tue Aug 8 2017
System image file is "flash:c2800nm-advsecurityk9-mz.124-3a.bin"

This product contains cryptographic features and is subject to United
States and local country laws governing import, export, transfer and
use. Delivery of Cisco cryptographic products does not imply
third-party authority to import, export, distribute or use encryption.
Importers, exporters, distributors and users are responsible for
compliance with U.S. and local country laws. By using this product you
agree to comply with applicable laws and regulations. If you are unable
to comply with U.S. and local laws, return this product immediately.

A summary of U.S. laws governing Cisco cryptographic products may be found at:

If you require further assistance please contact us by sending email to

Cisco 2811 (revision 53.51) with 249856K/12288K bytes of memory.
Processor board ID FCZ094272GH
2 FastEthernet interfaces
32 Serial interfaces
4 ISDN Basic Rate interfaces
2 Channelized E1/PRI ports
1 Virtual Private Network (VPN) Module
DRAM configuration is 64 bits wide with parity enabled.
239K bytes of non-volatile configuration memory.
62592K bytes of ATA CompactFlash (Read/Write)

Configuration register is 0x2102

The advanced security feature set does not contain voice features. You would need to upgrade the IOS to a version with voice features for the command to work.


Can you suggest which IOS version compatible .


You'll need a minimum of IP Voice feature set. See the following link for other feature sets that contain voice functionality.


I have update the IOS.



Hi Brandon,

Kindly find the Run config after configured the SIP and fax .

I need check is it correct config or need add else before connecting the ISDN line.

Thanks for suggestion .




I did it, using sccp

Just add a new gateway on the CUCM in my case is 2951

add with sccp select correct module and slot for the fxs

here is router config...

stcapp ccm-group 1


sccp local GigabitEthernet0/0
sccp ccm identifier 2 version 7.0
sccp ccm identifier 1 version 7.0

dial-peer voice 9020 pots
service stcapp
port 0/2/0
dial-peer voice 9021 pots
service stcapp
port 0/2/1
dial-peer voice 9022 pots
service stcapp
port 0/2/2
dial-peer voice 9023 pots
service stcapp
port 0/2/3

here is the show for stcapp

Port       Device          Device   Call          Dev     Directory   Dev
Identifier Name            State    State         Type    Number      Cntl
---------- --------------- -------- ------------- ------- ----------- ----
0/2/0      ANXXXXXXXXXXX100 IS       IDLE           ALG     7080       CCM
0/2/1      ANXXXXXXXXXXX101 IS       IDLE           ALG     7081       CCM
0/2/2      ANXXXXXXXXXXX102 IS       IDLE           ALG     7082       CCM
0/2/3      ANXXXXXXXXXXX103 IS       IDLE           ALG     7083       CCM


Hi Thanks for reply.

i m getting the error msg please find the screen shot.


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