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Shobhit Sinha

FAX is not working.

IOS Version : c3845-advipservicesk9-mz.151-3.T1.bin

When I am dialing FAX number it is ringing and also getting FAX tone but FAX is not going or coming.Also FXS ports are registered in CUCM.

Need your advice to troubleshoot.

Below is the configuration of my router:

voice-port 0/2/0
cptone AT
voice-port 0/2/1
cptone AT
voice-port 0/2/2
cptone AT
voice-port 0/2/3
cptone AT

ccm-manager redundant-host x.x.x.x

ccm-manager mgcp
no ccm-manager fax protocol cisco
ccm-manager music-on-hold
ccm-manager config server x.x.x.x
ccm-manager config
mgcp call-agent x.x.x.x. service-type mgcp version 0.1
mgcp rtp unreachable timeout 1000 action notify
mgcp modem passthrough voip mode nse
mgcp package-capability rtp-package
mgcp package-capability sst-package
mgcp package-capability pre-package
no mgcp package-capability res-package
no mgcp timer receive-rtcp
mgcp sdp simple
mgcp fax t38 ecm
mgcp rtp payload-type g726r16 static
mgcp profile default

dial-peer voice 999020 pots 
service mgcpapp
port 0/2/0
dial-peer voice 999021 pots
service mgcpapp
port 0/2/1
dial-peer voice 999022 pots
service mgcpapp
port 0/2/2
dial-peer voice 999023 pots 
service mgcpapp
port 0/2/3

Rising star

This community does not provide technical support and is not staffed with technical support experts. I recommend you post this and future technical support questions to the Cisco Support Community ( where our Cisco technical support experts provide assistance. Another option is to open a ticket with the Cisco Technical Assistance Center ( to get expert debugging assistance.

We do encourage you to participate in the Cisco Collaboration Community and to also join our Cisco Collaboration User Group program!  In the community, we encourage your discussion/sharing around collaboration topics and Cisco Collaboration Solutions, including business and IT requirements, industry trends, process, culture/organization issues, how collaboration can be used to transform businesses, vendor selection, adoption, training, architecture, licensing, and product features/functionality. If you are a customer or partner, you can also join the user group program to be eligible for member-only events and influence product direction.

We hope to hear from you again.

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Moderator for the Cisco Collaboration Community

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