*CLI>     -- Executing Dial("SIP/ip-phone-8ff9", "SIP/stigcompaq|20|tr") in new stack
    -- Called stigcompaq
    -- SIP/stigcompaq-ed55 is ringing
Aug 31 16:11:34 WARNING[81925]: chan_sip.c:2758 process_sdp: No compatible codecs!
    -- SIP/stigcompaq-ed55 answered SIP/ip-phone-8ff9
    -- Attempting native bridge of SIP/ip-phone-8ff9 and SIP/stigcompaq-ed55
    -- Attempting native bridge of SIP/ip-phone-8ff9 and SIP/stigcompaq-ed55
  == Spawn extension (sip, 1, 1) exited non-zero on 'SIP/ip-phone-8ff9'
    -- Saved useragent "Tecom tphone IP Phone v1.9.11" for peer ip-phone