dhcppc5*CLI>
    -- Starting simple switch on 'Zap/1-1'
Mar  3 23:16:11 WARNING[9142]: chan_zap.c:6137 ss_thread: CallerID returned with error on channel 'Zap/1-1'
    -- Executing NoOp("Zap/1-1", " -  - ") in new stack
    -- Executing Dial("Zap/1-1", "SIP/blah|30|Ttr") in new stack
We're at 192.168.172.15 port 17006
Adding codec 0x8 (alaw) to SDP
Adding non-codec 0x1 (telephone-event) to SDP
13 headers, 10 lines