Linksys SPA VOIP phone rejects calls from Skype SIP Trunk on Asterisk

Setup

• Asterisk Trixbox 2.6 Server
• Skype Connect SIP trunk to accept incoming Skype calls
• Linksys SPA and Cisco SPA VOIP phones

Issue

Incoming calls via Skype to some Linksys / Cisco IP phones get rejected. Asterisk debug show following reason :

-- Called 715
-- Got SIP response 406 "Not Acceptable" back from 192.168.6.19
-- No one is available to answer at this time (1:0/0/0)

Asterisk (Trixbox) hangs on "recordingcheck" and drops calls

Issue

Asterisk (TrixBox) server is not functioning properly. Internal calls working fine, but external incoming and outgoing time-out and fail. Looking at Asterisk Command Line Interface (CLI) output (connect with asterisk -r) noticed unusual behaviour:

Normally when incoming call is received, Asterisk outputs number of executed actions into CLI and receiving phone starts ringing in less than a second. On this occasion, however, Asterisk was stopping at following line and hanging for about 7 seconds:

VERBOSE[29592] logger.c: -- Launched AGI Script /var/lib/asterisk/agi-bin/recordingcheck

Then, if caller was still on a phone it would go to:

VERBOSE[29602] logger.c: -- Launched AGI Script /var/lib/asterisk/agi-bin/dialparties.agi

It would be stuck there for a few more seconds and eventually call would be dropped. In fact occasionally receiving handset would actually ring (probably long after caller has hanged the phone).

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