Hi Mark,

I'm pretty sure the 7937 does not have the "Built-in Bridge" capabilities required for Call Recording.

Call recording in Unified Communications Manager Release 6.1(1) is supported by all 3rd-generation phones (Cisco Unified IP Phone 7911G, 7931G, ,7941G, 7941G-GE, 7961G, 7961G-GE, 7970G, and 7971G-GE models).

Silent Monitoring/Recording Architecture

Cisco has adopted an IP phone-based approach for silent monitoring instead of the typical SPAN approach. The agent's phone mixes the media streams of the agent-to-customer call and sends that stream to the supervisor.

Cisco has also adopted an IP phone-based approach for call recording. The agent's phone relays the two media streams of the agent-to-customer call to the recorder.

Both features rely on the phone's internal DSP resources (BIB).

http://www.cisco.com/en/US/docs/voice_ip_comm/uc_system/UC6.1.1/features_apps/CMmonrec.html#wp998251

Hope this helps!

Rob