CUCM-SIP to ISP - Flight mode calls issue

[nibinrodrigues]

Dear All,

We are having CUCM running version 8.6 connected to Voice Gateway via sip Tunk and from Gateway to ISP SIP trunk

Issue - IP Phone is continiously ringing eventhough I put my cell phone/mobile in Flighmode or Switch off. I am expecting message from ISP like "The person your are trying to reach is not avilable".

ISP bring their testing system and in that we are getting these alerts but when connect back to our PABX its riniging like normal call.

dial-peer voice 100 voip
service ses
destination-pattern .T
redirect ip2ip
session protocol sipv2
session target XXXXXX
voice-class sip dtmf-relay force rtp-nte
dtmf-relay sip-notify rtp-nte
codec g711alaw
no vad

Thanks

Nibin

[Carlo Poggiarelli]

Hi Nibin,

did you configure a call forward or a remote destination to let your mobile ring?

Let me know.

Regards

Carlo

[nibinrodrigues]

Dear Carlo,

My issue is that eventhogh the remote end is not accessable ie Switch off or in flight mode, still the IP Phone rings and user feels the remote party is not answering his call.

there is no configuration made for call forward.

Thanks

[Carlo Poggiarelli]

Dear Nibin,

Understand.

As suggested from my buddy Vivek :) we need a debug ccsip message output to better analyze your issue.

Thanks

Regards

Carlo

[nibinrodrigues]

Dear Vivek/Carlo,

Please find below the attached ccsip message.

Customer number: 40004577  

My mobile in number 55004439 (in flight mode)

We also requested ISP to check the issue from their end and they bring their PABX test system and found no issues. They where getting message like "The person you are trying to reach is not avilable"

Thanks

Nibin

[Vivek Batra]

Hi Nibin,

This is one of the worst SDP negotiation I've ever seen. 

Anyway, enable SDP early offer in CUBE and probably it will solve the issue. If not, request you to again share the output of debug ccsip messages after making appropriate changes.

voice server voip

 early-offer forced

- Vivek

[nibinrodrigues]

Dear All,

Sorry for the long delay. Customer only provide me the maintenance window today.

As you advised, I enabled early-offer forced under sip, But the result is same. I am attaching my VG configuration and debug output 1 more more.

Thanks

Nibin

[Ayodeji Okanlawon]

Hi,

From the logs we can see that your ITSP is sending media in the 183 session progress. We need to try and enable PRACK on CUCM, to see if the announcement that is being played comes through..

Go to the sip profile assigned to the sip trunk and under trunk specific configuration>SIP Rel1XX Options>Send PRACK if 1xx contains SDP

[nibinrodrigues]

Dear Ayodeji,

Thanks for the suggestion, I will apply the setting today and update you the status.

Thanks

[Vivek Batra]

Hi Nibin,

Please follow the steps as suggested by Deji and share the results.

- Vivek

[Vivek Batra]

Nibin - Can you please share the output of debug ccsip messages?

- Vivek