I have hung up the phone,but the chanel still active .So I cant call the user again.Why? Is it because of low network speed?
sterisk1*CLI> sip show channels
Peer User/ANR Call ID Seq (Tx/Rx) Form Hold Last Message
218.109.50.100 1002 0e01677f749 00102/00000 ulaw No Tx: ACK
58.100.49.44 1001 4F5114E3-31 00101/07227 ulaw No Rx: INVITE
2 active SIP channels