About Joon Sung Bae

Joon Sung Bae · 05-28-2015

Hi folks,I have an issue where incoming calls are not working over SIP trunk in my CME.I have got a 2821 CME along with SIP trunk from an ISP looking like below. ISP --- SIP Trunk --- ADSL Modem (Bridge mode) --- CME --- SCCP phones Outgoing calls w...

Joon Sung Bae · 03-26-2015

Hi, I have a problem where SNR can't retrieve calls from mobiles to associated IP phones. When someone dials my DID to my desk phone, after a few seconds my mobile will ring as well without any issues because of SNR. When I pick up on my mobile, I ca...

Joon Sung Bae · 11-30-2016

Thanks Inderpal, Just trying to clarify a doubt in understanding PORT license for CUE. If I purchase a ISM-SRE-300 or SM-SRE-710 module separately without CUE loaded, and then install CUE afterwards, does this mean I do not need to purchase PORT lice...

Joon Sung Bae · 03-28-2015

OK. I have found the issue. The problem was when I hang up on my mobile, the other end actually was not completely disconnected because the ISDN does not send RELEASE message to the ISP until ISDN expiry timer is met. (30 sec)So, after I hung up, the...

Joon Sung Bae · 03-27-2015

I had a similar issue with different phones.Try factory default / delete and reconfigure the phone on CUCM again.

Joon Sung Bae · 03-26-2015

Just logged a TAC case on this issue. Please advise if you could think of any solution.I will update the result once the solution is found.

Joon Sung Bae · 03-26-2015

Make sure the NTP server IP is valid and reachable from your CUCM. What is the phone model?, and have you checked the status message on those phones?

Member Since	‎11-23-2013 06:41 PM
Date Last Visited	‎05-03-2019 01:42 AM
Posts	11
Total Helpful Votes Received	5

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SIP Trunk Incoming call issue in CME

SNR can't retrieve calls from mobile to IP phones

Thanks Inderpal,

OK. I have found the issue.

I had a similar issue with

Just logged a TAC case on

Make sure the NTP server IP