What this mean

Asterisk Asterisk Support
1

I have hung up call.but I can see following chanle information
asterisk1CLI> sip show channels
Peer User/ANR Call ID Seq (Tx/Rx) Form Hold Last Message
61.170.239.88 101 2cfe9a38586 00102/63118 unkn No (d) Rx: BYE
1 active SIP channel
asterisk1CLI>
asterisk1CLI> sip show channels
Peer User/ANR Call ID Seq (Tx/Rx) Form Hold Last Message
61.170.239.88 101 2cfe9a38586 00102/63118 unkn No (d) Rx: BYE
1 active SIP channel
asterisk1CLI> sip show channels
Peer User/ANR Call ID Seq (Tx/Rx) Form Hold Last Message
61.170.239.88 (None) 0942a183257 00102/00000 unkn No Init: OPTIONS
61.170.239.88 101 2cfe9a38586 00102/63118 unkn No (d) Rx: BYE
2 active SIP channels
asterisk1CLI> sip show channels
Peer User/ANR Call ID Seq (Tx/Rx) Form Hold Last Message
61.170.239.88 101 2cfe9a38586 00102/63118 unkn No (d) Rx: BYE
1 active SIP channel
asterisk1CLI> sip show channels
Peer User/ANR Call ID Seq (Tx/Rx) Form Hold Last Message
61.170.239.88 (None) 43cb202879f 00102/00000 unkn No Init: OPTIONS
61.170.239.88 101 2cfe9a38586 00102/63118 unkn No (d) Rx: BYE
2 active SIP channels
asterisk1CLI> sip show channels
Peer User/ANR Call ID Seq (Tx/Rx) Form Hold Last Message
61.170.239.88 101 2cfe9a38586 00102/63118 unkn No (d) Rx: BYE
1 active SIP channel
asterisk1CLI> sip show channels
Peer User/ANR Call ID Seq (Tx/Rx) Form Hold Last Message
61.170.239.88 101 2cfe9a38586 00102/63118 unkn No (d) Rx: BYE
1 active SIP channel
asterisk1*CLI> sip show channels
Peer User/ANR Call ID Seq (Tx/Rx) Form Hold Last Message
61.170.239.88 (None) 2c7c730d526 00102/00000 unkn No Init: OPTIONS
61.170.239.88 101 2cfe9a38586 00102/63118 unkn No (d) Rx: BYE
2 active SIP channels