PSTN calls are not goin to voice mail

[Yenosh]

Hi All, 

I have an issue when PSTN users are calling calls are not going to voice mail.

1)  Internal calls are going to voice mail.

2) Whn calling from PSTN number , call i snever going to voice mail it is keep on ringinng. If I enable call forward all to voic email, it is getting disconnected immediatly.

It seems to be an issue with all sites in cluster

Call Flow :

PSTN --> SBC -(Sending the call in Non-DID format, SBC is doing translation)-> CUCM-->CUC.

Opened a TAC  and they are saying SBC sending disconnect with "protocol error". Not sure what exactly this means. Any suggestions on this would greatly helps.

[John Steele]

"protocol error" could mean a few things it could be related to the SIP headers and how they are being presented to CUCM or vice versa.

[Nithin Eluvathingal]

Before addressing the issue of PSTN calls not forwarding to voicemail, can you confirm if internal calls are going to voicemail? I hope there are no issues with calls from PSTN reaching your CUCM and desk phones. What are your call forwarding settings on the phone? Could you share a screenshot of the configuration if you don't mind?

[Yenosh]

Hi Nithin,

yes, internal calls are going to voice mail.there is no issue with phone calls. I xan not take the screen shot of the settings but all configs all line good.even if I enable call forward all to vm , call is immediatly getting disconnected not even coneecting.

[Nithin Eluvathingal]

Do you have the logs for these failed calls? We need to see who disconnected the calls.

[Scott Leport]

Hello, 

Do you have Voice Mail option ticked on the Forward No Answer External setting on the DN line configuration?