PSTN Call Waiting on CUCM 6.X

Unanswered Question
Jan 8th, 2009

Guys

this might be a very simple question but i have a lab im setting up in the office and i have one phone line connected to my FXO port. im running CCM 6.1 and the call goes directly (PLAR) to my extension.

my PSTN line call call waiting on it. if im on the phone and a second call comes in i hear the alert on my ip phone but i have no idea on what i need to do to pull the call. is there something simliar to "flash" that i can configure on my phone to pull the second call?

I have this problem too.
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Nicholas Matthews Sat, 01/10/2009 - 12:14

Hi,

This feature isn't supported for CUCM, but it can be supported in CME.

Here is the command for CME:

http://www.cisco.com/en/US/docs/voice_ip_comm/cucme/command/reference/cme_f1ht.html

CUCM supports hookflash transfers over T1 CAS (built into transfer key):

http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/admin/4_2_1/ccmsys/a08gw.html#wp1117633

But the 'Flash' softkey doesn't have support in CUCM yet.

hth,

nick

a.gooding Sun, 01/11/2009 - 08:41

guys thanks

i know its supported on CME as it works fine on my CME Lab. so is there any specific reason that it isnt supported or will ther be support sometime soon.

is it just me or is that kind of backward?

rob.huffman Sat, 01/10/2009 - 11:33

Hi Guys,

This is possible with CME but not CUCM;

http://www.cisco.com/en/US/docs/voice_ip_comm/cucme/admin/configuration/guide/cmesoftk.html#wp1013091

Here is the bug for CUCM from Michael @ Cisco;

CSCdv71088 - CallManager cannot do a hookflash on a fxo line with Call Waiting.

Release Note:

Symptom: Ip phone cannot answer call waiting beep sent by the telco

Problem: CallManager does not have the means to send the H245 message to the gateway to answer the Call Waiting call

Workaround: Create a hunt group of FXO so the call always comes in on a new trunk and now use Call Waiting on the PSTN (use CallManager call waiting).

http://tools.cisco.com/Support/BugToolKit/search/getBugDetails.do?method=fetchBugDetails&bugId=CSCdv71088

Hope this helps!

Rob

a.gooding Sun, 01/11/2009 - 08:44

Also

we are saying its not supported but the workaround is

Workaround: Create a hunt group of FXO so the call always comes in on a new trunk and now use Call Waiting on the PSTN (use CallManager call waiting).

What is the CallManager call waiting and how is this enabled?

rob.huffman Sun, 01/11/2009 - 15:37

Hey Arvind,

This workaround is not really a viable solution. It references the need for additional FXO Trunks from your Telco provider setup in a Hunt Group, where your second call actually comes in on another Trunk. I don't think this will help for your config.

Hope this helps! Sorry man!

Rob

a.gooding Mon, 01/12/2009 - 05:11

Guys

thanks for all the assistance. I only realized this setting up my lab but im sure ill get asked this later on for some of my customers.

thanks again

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