*CLI> sip show channels
Peer             User/ANR    Call ID      Seq (Tx/Rx)   Format
192.168.1.100    (None)      646482F4671  00101/56547   unknow
192.168.1.102    (None)      0662b3a469b  00102/00000   unknow
192.168.1.100    201         6dca4924248  00102/00000   gsm   
217.10.79.219    7218002     35feee0f733  00101/00102   ulaw  
4 active SIP channel(s)