[asterisk-users] Dead SIP channels

[Gary Chen]

I am using a2billing as calling card platform with asterisk 1.2.17. 
After running for several days, if I issue 'sip show channels' command, I got a lot of dead sip channels although 'show channels'  command only show 5 channels. What cause these dead channels? How can I clean out these dead channels? Will they pose any problem to my * server if left alone? What does this (d) mean?
Here is the output from 'sip show channels':
 
Peer                         User/ANR    Call ID      Seq (Tx/Rx)  Form  Hold     Last Message
195.7.123.234     +180924402  3c3c4cee419  00102/00000  alaw  No       Tx: ACK
9.9.94.9              6478517573  2752611-195  00101/00001  ulaw  No       Rx: ACK
136.59.30.19       8787041796  76775e35788  00102/00000  ulaw  No       Tx: ACK
9.9.95.13             9057047798  2752419-199  00101/00001  ulaw  No       Rx: ACK
195.7.123.234     +011503733  25afde8070b  00102/00002  unkn  No  (d)  Rx: BYE
195.7.123.234     +011503733  71688696061  00102/00002  unkn  No  (d)  Rx: BYE
195.7.123.234     +011503733  1700ab8b2ae  00102/00002  unkn  No  (d)  Rx: BYE
195.7.123.234     +011578435  0ecb33f75bb  00102/00002  unkn  No  (d)  Rx: BYE
195.7.123.234     +011962642  71eac20715c  00102/00002  unkn  No  (d)  Rx: BYE
195.7.123.234     +011962642  01b9eacf6de  00102/00002  unkn  No  (d)  Rx: BYE
195.7.123.234     +011962642  744e7a3f501  00102/00002  unkn  No  (d)  Rx: BYE
195.7.123.234     +011962642  0080443e6ad  00102/00002  unkn  No  (d)  Rx: BYE
195.7.123.234     +011962642  6f3745a266d  00102/00002  unkn  No  (d)  Rx: BYE
195.7.123.234     +011221693  3b705a03141  00102/00002  unkn  No  (d)  Rx: BYE
195.7.123.234     +011595981  4ab469132b7  00102/00002  unkn  No  (d)  Rx: BYE
195.7.123.234     +011595981  0b2dcf2332b  00102/00002  unkn  No  (d)  Rx: BYE
195.7.123.234     +011595981  583bd73d09a  00102/00002  unkn  No  (d)  Rx: BYE
195.7.123.234     +011593222  4d237ba325e  00102/00002  unkn  No  (d)  Rx: BYE
195.7.123.234     +011639103  33f84238290  00102/00002  unkn  No  (d)  Rx: BYE
195.7.123.234     +011526778  72bd7b5f080  00102/00002  unkn  No  (d)  Rx: BYE
195.7.123.234     +011527693  0ffa93c642d  00102/00002  unkn  No  (d)  Rx: BYE


gary
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