Помогите разобраться с проблемой. Member не отвечает

Всем привет.

Периодически стала возникать такая ситуация: звонок приходит из PSTN сети, становится в очередь и висит там по несколько минут, хотя в этот момент есть свободные member. Вот пример:

taxi-operators has 3 calls (max unlimited) in 'random' strategy (3s holdtime, 29s talktime), W:0, C:1301, A:97, SL:0.0% within 0s
   Members: 
      SIP/110 with penalty 2 (Unavailable) has taken no calls yet
      SIP/109 with penalty 2 (Unavailable) has taken no calls yet
      SIP/108 with penalty 2 (Unavailable) has taken no calls yet
      SIP/107 with penalty 2 (Not in use) has taken 308 calls (last was 217 secs ago)
      SIP/106 with penalty 2 (Unavailable) has taken no calls yet
      SIP/105 with penalty 2 (Not in use) has taken 209 calls (last was 242 secs ago)
      SIP/104 with penalty 2 (Not in use) has taken 310 calls (last was 538 secs ago)
      SIP/103 with penalty 2 (Unavailable) has taken no calls yet
      SIP/102 with penalty 2 (Unavailable) has taken no calls yet
      SIP/101 with penalty 1 (Unavailable) has taken 474 calls (last was 77399 secs ago)
      SIP/100 with penalty 1 (Unavailable) has taken no calls yet
   Callers: 
      1. DAHDI/5-1 (wait: 4:28, prio: 0)
      2. DAHDI/8-1 (wait: 0:59, prio: 0)
      3. DAHDI/4-1 (wait: 0:12, prio: 0)

т.е. видно, что операторы свободны, но звонки продолжают висеть. Операторы утверждают, что у них все включено и на все звонки отвечают. Подскажите, куда копать?

queues.conf

[taxi-operators]

timeoutpriority = conf

; How long call to member
timeout = 15

; Time switching to another menber
retry = 5


;How often spek periodic message
periodic-announce-frequency=15

;Path to periodic message
periodic-announce = ru/queue-periodic-announce

;Music class
musicclass = mymoh

; generate events
eventwhencalled = yes


;Strategy of calls

strategy = random


; Recording
monitor-format = wav

monitor-type = MixMonitor

; Don`t send calls to busy operators
ringinuse = no

defaultrule=rule057

;announce-holdtime = yes

;announce-position = yes


;Queue members
member => SIP/100,1

member => SIP/101,1

member => SIP/102,2

member => SIP/103,2

member => SIP/104,2

member => SIP/105,2

member => SIP/106,2

member => SIP/107,2

member => SIP/108,2

member => SIP/109,2

member => SIP/110,2

;member => SIP/112,1

queuerules.conf

[rule057]

penaltychange => 17,+1,+1   ; 30 seconds into the call increase the QUEUE_MAX_PENALTY by