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BLF\CallPark Subscriptions Fail after several days.
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habile Offline
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Post: #3
RE: BLF\CallPark Subscriptions Fail after several days.
(05-13-2014 03:28 AM)bnelson Wrote:  Hello,

We are seeing some consistent behavior in both the T2x series and T-4x series of phones(T-3x possibly, but we don't have many in production), where working BLF\CallPark subscriptions to the asterisk server stop working after a long(few days) period of time.

From packet captures, I can see that the phones simply stop sending the SUBSCRIBE requests to the server. Sending a force reboot notify restarts the phone, and SUBSCRIBE requests resume normally.

During the time when the BLF\CallPark SUBSCRIBE messages are not being sent, I am still seeing SUBSCRIBE requests for MWI, so not all SUBSCRIBE functionality is broken.

I am unable to see anything obvious in the phone's logs that indicate why they stop sending the SUBSCRIBE, and the last thing on our server is a successful NOTIFY send to the phone for a state update.

So, I was wondering if anyone else was experiencing this, or if anyone knows of behavior in the phone firmware that would blacklist a BLF SUBSCRIBE from being used after a certain number of failures(for whatever reason). We do require authentication for BLF, so every SUBSCRIBE is initially rejected with a challenge to provide password authentication. This process normally works fine, but I'm wondering if there is an internal counter for 401 messages....


All I can say is that with my T48 ( and Asterisk (11.something) I do not see this issue.

What is Subscribe Period(seconds) set to in Account->Advanced? Does asterisk show the subscriptions in 'sip show subscriptions' ?

(This post was last modified: 06-17-2014 04:10 PM by habile.)
06-17-2014 04:04 PM
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RE: BLF\CallPark Subscriptions Fail after several days. - habile - 06-17-2014 04:04 PM

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