In one of my network I have few SPA942 and one SPA504 with console SPA500S.
Asterisk is 1.4.22. After connecting to the network console SPA500S I have a small problem.
The console works fine but there are many such messages:
[Jun 13 09:42:46] WARNING: chan_sip.c:15456 handle_request_subscribe: SUBSCRIBE failure: unrecognized format: 'multipart/related' pvt: subscribed: 0, stateid: -1, laststate: 0, dialogver: 0, subscribecont: 'hinty', subscribeuri: ''
What may cause this symptom?