Calls intermittently not connecting, or not receiving a dial tone.

[Burney Rogers]

I have two users saying the have dial tone delay when picking up the handset. I am sure this is the actual problem. The statement below was sent to me via email. Any input would be appreciated.

Thanks,

Calls intermittently not connecting, or not receiving a dial tone.

[dvowell]

Can you give us some idea of the topology?

Are these phones located at the same site as the CUCM/CME?

Are these analog or IP phones?

Is this a CUCM or CME deployment? If so what version?

If these are IP phones, are there other phones on the same LAN switch and if so do they work ok?

Do you have QoS enabled?

Do you have any network performance issues with other devices or applications?

[Brian Lavallee]

Dial tone delay is normally indicates a QoS or other network issue. Dial tone is locally provided by the phone, but initated by the CUCM.

The basic flow is like this:

Phone: Goes off-hook

Phone >> CUCM: I'm off-hook!

CUCM >> Phone: Go ahead and provide dial tone.

Phone: Plays dial tone.

I have seen hook switch issues that have similar symptoms, a false positive for network issues.

To test the hook switch, use the speaker button to go off-hook. If there is a different between lifting the handset from the cradle and the speaker button, you have a hardware issue.

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