Michael,
There are many commands..If using a PRI, you may see the active calls using "sh isdn active".
You may also use "show call active voice brief" to get detailed info about the call legs.
Also try
"show voice call summary"
"show voice call status"
PSTNSw#show voice call status
CallID CID ccVdb Port DSP/Ch Called # Codec Dial-peers
0x42F 18AD 0x462DBF14 50/0/13.0 8888 g711ulaw 20015/10001
1 active call found
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PS: please remember to rate posts!
Sankar Nair
UC Solutions Architect
Pacific Northwest | CDW
CCIE Collaboration #17135 Emeritus