[cisco-voip] CUCM sends presence subscribe messages to PSTN SIP trunk - found solution to block

[Brian V]

I'm working on remotely setting up a CUBE for a customer and I'm using CIPC
(in sccp mode) to perform some basic testing.

I have the *debug ccsip messages* enabled on the CUBE, and navigated to my
placed calls directory on the CIPC phone.

[image: Inline image 1]

As soon as I did that I saw 2 subscribe messages show up on the CUBE from
CUCM for the 2 numbers in the placed calls list.

The CUCM cluster has BLF for call lists enabled.

The 88. is a temp access code I'm using to send calls to the CUBE.  Route
list strips the 88. and then pre-pends a 9

This is reproducible, every time the placed calls list is opened, I see
subscribe messages to CUBE for any of the calls that traversed it.

CUBE didn’t respond to the messages and I don’t believe it will. But I can
see in a large company not wanting to send all this messaging to CUBE.



000285: Dec 22 11:10:15.370: //-1/xxxxxxxxxxxx/SIP/Msg/ccsipDisplayMsg:

Received:

SUBSCRIBE sip:918004444444 at 10.yy.2.6:5060 SIP/2.0

Via: SIP/2.0/TCP 10.xx.8.6:5060;branch=z9hG4bK101c952867a3cc

From: <sip:82ab6558-ed4e-c6fe-4655-9de41b0994a8 at 10.xx.8.6>;tag=1127369285

To: <sip:918004444444 at 10.xx.2.6>

Call-ID: 80367b00-85c108f7-ef000-608200a at 10.xx.8.6

CSeq: 101 SUBSCRIBE

Date: Thu, 22 Dec 2016 17:10:15 GMT

User-Agent: Cisco-CUCM11.0

Event: presence

Expires: 10800

Contact: <sip:82ab6558-ed4e-c6fe-4655-9de41b0994a8 at 10.xx.8.6
:5060;transport=tcp>

Accept: application/pidf+xml

Max-Forwards: 69

Content-Length: 0





000286: Dec 22 11:10:15.380: //-1/xxxxxxxxxxxx/SIP/Msg/ccsipDisplayMsg:

Received:

SUBSCRIBE sip:918005532447 at 10.yy.2.6:5060 SIP/2.0

Via: SIP/2.0/TCP 10.xx.8.6:5060;branch=z9hG4bK101c963da3f899

From: <sip:82ab6558-ed4e-c6fe-4655-9de41b0994a8 at 10.xx.8.6>;tag=1494595130

To: <sip:918005532447 at 10.xx.2.6>

Call-ID: 80367b00-85c108f7-ef001-608200a at 10.xx.8.6

CSeq: 101 SUBSCRIBE

Date: Thu, 22 Dec 2016 17:10:15 GMT

User-Agent: Cisco-CUCM11.0

Event: presence

Expires: 10800

Contact: <sip:82ab6558-ed4e-c6fe-4655-9de41b0994a8 at 10.xx.8.6
:5060;transport=tcp>

Accept: application/pidf+xml

Max-Forwards: 69

Content-Length: 0



Not sure if this is a CIPC quirk or if it’s a CUCM function to check BLF
presence status on behalf of SCCP phones. (I'm leaning towards the latter,
but since I'm currently remote I don’t have any other way to test SCCP
phones at the moment)



In any case, to stop the behavior I created another BLF presence Group, and
blocked presence IN BOTH DIRECTIONS with the default group and then
assigned the presence group to the sip trunk

 [image: Inline image 2]

[image: Inline image 1]


[image: Inline image 2]

*SIP Trunk Setting*

 [image: Inline image 3]

This stopped the subscribe messages from being sent to the CUBE.
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