-- Accepting call from '' to '9799' on channel 0/21, span 1
    -- Executing Dial("Zap/21-1", "Zap/G5/9799") in new stack
Nov 30 21:18:17 WARNING[7729]: chan_zap.c:4453 zt_new: Channel 164 already has a Real call
    -- Called G5/9799
    -- Moving call from channel 164 to channel 163
    -- Zap/164-1 answered Zap/21-1