[asterisk-users] Dropped calls

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I've been getting a number of dropped calls today with the following 
visible in the logs:


Feb  5 12:06:29 DEBUG[8340] channel.c: Bridge stops because we're zombie 
or need a soft hangup: c0=SIP/peachnet-213243-b7830fd8, 
c1=SIP/2142-08f4b6a0, flags: No,No,No,Yes
Feb  5 12:06:29 DEBUG[8340] channel.c: Bridge stops bridging channels 
SIP/peachnet-213243-b7830fd8 and SIP/2142-08f4b6a0
Feb  5 12:06:29 DEBUG[8340] res_features.c: Timed out for feature!
Feb  5 12:06:29 WARNING[8340] res_features.c: Bridge failed on channels 
SIP/peachnet-213243-b7830fd8 and SIP/2142-08f4b6a0
Feb  5 12:06:29 DEBUG[8340] chan_sip.c: update_call_counter(2142) - 
decrement call limit counter


Can anyone point out what might be calling this sort of behaviour?