[Oct 27 18:46:48] DEBUG[25028]: pbx.c:3696 pbx_extension_helper: Launching 'Set'
[Oct 27 18:46:48] DEBUG[25028]: pbx.c:3696 pbx_extension_helper: Launching 'Dial'
[Oct 27 18:46:48] DEBUG[25028]: chan_sip.c:23241 sip_request_call: Asked to create a SIP channel with formats: 0x4 (ulaw)
[Oct 27 18:46:48] DEBUG[25028]: chan_sip.c:7381 sip_alloc: Allocating new SIP dialog for 2ccf324d10670f2c73f478b523f926a4 at 10.15.1.1 - INVITE (With RTP)
Really destroying SIP dialog '2ccf324d10670f2c73f478b523f926a4 at 10.15.1.1'
Method: INVITE
[Oct 27 18:46:48] WARNING[25028]: app_dial.c:1750 dial_exec_full: Unable to create channel of type 'SIP' (cause 20 - Unknown)
[Oct 27 18:46:48] DEBUG[25028]: rtp.c:2148 ast_rtp_early_bridge: Channel '<unspecified>' has no RTP, not doing anything
[Oct 27 18:46:48] DEBUG[25028]: app_dial.c:2326 dial_exec_full: Exiting with DIALSTATUS=CHANUNAVAIL.
[Oct 27 18:46:48] DEBUG[25028]: pbx.c:3696 pbx_extension_helper: Launching 'Hangup'
[Oct 27 18:46:48] DEBUG[25028]: pbx.c:4322 __ast_pbx_run: Spawn extension (phones,15102857673,3) exited non-zero on 'SIP/101-0000000a'
[Oct 27 18:46:48] DEBUG[25028]: channel.c:1715 ast_softhangup_nolock: Soft-Hanging up channel 'SIP/101-0000000a'