Cisco Voicemail Ports constantly calling Phone

[chrzan]

Hello,

                We have Cisco Call manager 10.5 and Unity 10.5. We have Cisco Voicemail ports with numbers 6901-6996. These numbers in a random order are constantly calling a call handler we have setup as a second line on a phone. It makes these calls every 5 seconds and when answered it is usually dead air or static. I have rebooted call manager and unity clusters. ny help is appreciated. thanks John

[Nithin Eluvathingal]

Can you explain the call handler call flow ?

what connection you have from ISP, is it analogue line? 

[chrzan]

The call handler just has 4 input options to transfer calls. 

The connection is not analog I believe it is a SIP trunk. Thanks

[chrzan]

Sorry our connection to isp is a PRI handoff

[Nithin Eluvathingal]

constantly calling a call handler we have setup as a second line on a phone:- what you mean by call handler setup as a second line on phone ?

[Adam Pawlowski]

I'm still a bit confused about the setup.

The call handler is on Unity Connection, and one or more of the options transfers back to a line on an IP Phone?

Perhaps a review of your CDR can give you an idea where the calls are coming from?

Does the pattern overlap with anything else (MWI extensions, dial codes, etc) that may be being inadvertently triggered by a call transfer or MWI from Unity (if the port CSS is not set properly or there's some malformed string in a transfer rule?)

[Elliot Dierksen]

Is it possible that one of your subscribers is configured to have Unity outdial when they have a message? The above comment by @Adam Pawlowski is also quite possible relevant. If there is no audio, that seems more likely that Unity is trying to use that as an MWI off/on number,