Turning a Cisco 1841 into a CME router for Call Processing

Long story short and before the question pops up; My 1841 IOS version has the Telephony Service features available.

I am trying to make my 1841 router to act as CME to configure IP Phones. However, the IP Phones boots successfully and it gets their ephone-dn assigned to them from the TFTP Telephony Service configuration but when I dialed internally from one extension to another, I get a long silence (Dialing timeout) followed by a busy signal.

Before someone give me the resolution; do I need to configure Dial-Peers for internal calls for four digit extensions?
I was able to replicate the configuration in Packet Tracer without any dial-peers and the phones were able to call one another locally.

What am I missing on a real gear that is not meant for UC but the IOS allows you to configure it?

Let me also tell you how my topology is setup...

1841 --> HP 3400 Procurve ---> Cisco 3560 Layer-3
The 1841 is the default-gateway for VLAN 77, the TFTP for the IP Phones, and the Internet router for the all LANs
The 3400 is the interface vlans ip addresses each with the IP Helper-Address syntax configured
The 3560 is the DHCP server and PoE switch for the IP Phones

The IP Phones are booting to the correct vlan with the correct TFTP information. I can see the extension numbers on the screen but when I dial one another, it does not work.

Your best effort will be greatly appreciated.

Than you,

Jaime A Bonilla
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José MéndezCommented:
You should be able to ring the extensions that are properly registered without further dialpeer creation. Here are a few show commands that can help:

gw#show telephony-service tftp-binding
gw#show ephone | i SCCP ← will show registered phones
gw#show ephone-dn summary

gw#show voice port summary ← off-hook ports and other details
gw#show voice call summary ← codec in use and port number
gw#show dial-peer voice summary ← line per line, tag, dest. pattern, session target or port number. Also shows if a dialpeer is operationally down (could be lack of port or session target to route the call to if destination-pattern is present)

gw#show ephone reg
gw#show telephony-service dial-peer
gw#show telephony-service voice-port
gw#show ephone attempted-registrations

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Versatile450Author Commented:
Thank you for the response. I was able to figure out what my issue was. I needed to install End-User licenses or the cme-full IOS software in my 1841 since the IOS version I am running does have the Telephony-Service features available but nothing else such as CME GUI access or End-Users or Firmware for the 7960 Phones. So I ended up buying a 2821 CME router.

My configuration was correct. All my phones pulled the correct setting from my 1841 with the extension No. I assigned to them, but then I got the busy signal between extension and it is because I did not have any End-User license running in my 1841.

Thank you, and I accept you response. Very nice of you.
Krishnan GCommented:
what version of IOS running on it ?. I have same platform 1841..would like to bring up telephony service on it
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