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New Member

SCCP FXS on 2911 with CUCM 10.X



CUCM >>> SCCP >>> ISR 2911 with fxs ports


this is my senario


the FXS is register on CUCM, a FAX is connected to the FXS i can call it but it will not ring

during the call when i press reset button the call will be disconnected means it's fully registered with the CUCM but i don't know what is the problem here




stcapp ccm-group 1
stcapp feature access-code
stcapp feature speed-dial
stcapp call-control mode feature
voice-card 0
 dsp services dspfarm
voice service pots
 fax rate disable
voice service voip
 no ip address trusted authenticate
 allow-connections h323 to h323
 allow-connections h323 to sip
 allow-connections sip to h323
 allow-connections sip to sip
 fax protocol pass-through g711alaw
  early-offer forced
  midcall-signaling passthru
voice class codec 1
 codec preference 1 g711ulaw
 codec preference 2 g711alaw
 codec preference 3 g729r8
voice-port 0/0/0
 cptone GB
 timeouts initial 60
 timeouts interdigit 60
 timeouts ringing infinity
 caller-id enable

ccm-manager config server 
ccm-manager config
ccm-manager sccp local GigabitEthernet0/0
ccm-manager sccp
sccp local GigabitEthernet0/0
sccp ccm identifier 1 version 7.0
sccp ccm identifier 2 version 7.0
sccp ccm group 1
 associate ccm 1 priority 1
 associate ccm 2 priority 2
 switchback method immediate
dial-peer voice 8940 pots
 service stcapp
 port 0/0/0


ANY HELP ......




New Member

Come on guys any help

Come on guys any help

Any particular reason why you

I'd love to help but, any particular reason why you want to run the port on SCCP and not MGCP? SCCP fax will not support T.38 and will make it more difficult. I run all my fax machines on FXS through MGCP, I can share a config if it helps.





New Member

Thanks Frank, yes it would be

Thanks Frank, yes it would be very helpful 

Ok, this is my config from my

Ok, this is my config from my CUBE, I run my cube as a SIP gateway with trunks to my ITSP and CUCM but adding a bit of mgcp to manage the devices attached. Please make sure you understand the technology and the changes you are making before you choose to adopt this config, this is simply an example of how I do it, your company needs may differ from mine. 







This will enable you to

This will enable you to register your fxs port with CUCM via MGCP, then in CUCM via the gateway device you can make adjustments like speed, error correction, and more details for your fax.

New Member

Hi ClypherusMGCP now is

Hi Clypherus

MGCP now is configured and the fxs has registered with the cucm but the problem stills the same

when i call the analog phone it will not ring but if you off-hock the handset you can hear the other end but they can't hear you

outgoing calls are OK



How are you connected to the

How are you connected to the PSTN? Sip trunk? 


When you check the configuration of you FXS port in call manager, does it look like this?: 

Cisco MGCP FXS Port
Analog Access
Device is trusted Device is not trusted
RegistrationRegistered with Cisco Unified Communications Manager
IP Address10.0.12.2






New Member

Yes SIP Trunk, also fxs mgcp

Yes SIP Trunk,


also fxs mgcp registered the same as yours

Ok, let me make sure I got

Ok, let me make sure I got all the facts: it does not ring when called. But if you pick up the handset you can hear the caller, and they cannot hear you. 

Next step: While "ringing" on the gateway do "debug vpm signal" and "Debug ccssip messages". Call from your cell phone, post both debugs separately.

Have you considered trying a different FXS card?





New Member

Thanks FranciscoThe problem

Thanks Francisco

The problem as cisco says the FXSDID is not supported with MGCP, i tried sip instead and now it's ok



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