[Asterisk-Users] controlling SIP subscriptions from SNOM phones

[Joseph Rothstein]

We recently deployed 10 SNOMs as part of a PBX hosted solution. We have one
phone setup as the receptionist phone, using hints to show busy office
lines. This all works as expected.

This is a new installation, and people are just starting to setup their
phones. For those of you not familiar with SNOM phones, there is a row of
keys on the right side of the phone which SNOM calls function keys. In order
to get the receptionist phone to see the "hinted" extensions, you have to
set DESTINATION and the extension in the SNOM setup web page. This causes
the receptionist phone to issue SIP SUBSCRIBE messages for the state of
these extensions. 

Now, one user, not the receptionist, has gone in and set his personal
numbers to these function keys thinking that DESTINATION meant setting a
number to dial out. So now I have a ton of SIP SUBSCRIBE messages for his
numbers.

I thought that in order for SIP SUBSCRIBE to work, I had to use 's
"subscribecontext=xxxxx" in the user's config in sip.conf so that SIP peers
could only subscribe to extensions in that particular context. See the
output below:

asterisk_test*CLI>
     -- Registered SIP '959' at 82.135.81.211 port 5062 expires 3600
     -- Saved useragent "snom320/4.4" for peer 959 Jan  6 20:11:29
ERROR[8677]: chan_sip.c:10790
handle_request_subscribe: Got SUBSCRIBE for extensions without hint.  
Please add hint to 008971940494 in context sanset Jan  6 20:11:29
ERROR[8677]: chan_sip.c:10790
handle_request_subscribe: Got SUBSCRIBE for extensions without hint.  
Please add hint to 0089956010 in context sanset Jan  6 20:11:29 ERROR[8677]:
chan_sip.c:10790
handle_request_subscribe: Got SUBSCRIBE for extensions without hint.  
Please add hint to 904 in context sanset Jan  6 20:11:29 ERROR[8677]:
chan_sip.c:10790
handle_request_subscribe: Got SUBSCRIBE for extensions without hint.  
Please add hint to 001708130105 in context sanset Jan  6 20:11:29
ERROR[8677]: chan_sip.c:10790
handle_request_subscribe: Got SUBSCRIBE for extensions without hint.  
Please add hint to 001709114321 in context sanset asterisk_test*CLI> sip
show peer 959 asterisk_test*CLI>

   * Name       : 959
   Secret       : <Not set>
   MD5Secret    : <Not set>
   Context      : sanset
   Subscr.Cont. : <Not set>
   Language     : de
   Accountcode  : sanset
   AMA flags    : Unknown
   CallingPres  : Presentation Allowed, Not Screened
   Callgroup    : >
   Pickupgroup  : >
   Mailbox      : 959 at sanset
   ...
   SIP Options  : (none)
   Codecs       : 0x100 (g729)
   Codec Order  : (g729)
   Status       : Unmonitored
   Useragent    : snom320/4.4
   Reg. Contact : sip:959 at 192.168.0.4:5062;line=uq15mxj7

I would think that if there is no subscribecontext set, that Asterisk should
ignore these subscribe messages instead of creating an error. I know that
subscribe is not complete in Asterisk, so I am thinking that this is a bug.

Has anyone else had this same problem? Or know of a way around this? Would
setting the LINE option on the web page work for callout? 

Regards to all,
Joe