Daniel,
I have never connected to a non-Cisco Call Agent, but I assume the configuration is very similar to the information provide in the URL.
I would try the following commands on the gateway:
mgcp
mgcp call-agent service type mgcp version 0.1
mgcp dtmf-relay voip codec all mode out-of-band
mgcp modem passthrough voip mode nse
mgcp package-capability rtp-package
no mgcp timer receive-rtcp
mgcp sdp simple
mgcp fax t38 inhibit
mgcp bind control source-interface FastEthernet0/0
mgcp bind media source-interface FastEthernet0/0
dial-peer voice 1 pots
application MGCPAPP
port 1/0/0
dial-peer voice 2 pots
application MGCPAPP
port 1/0/1
dial-peer voice 3 pots
application MGCPAPP
port 1/0/2
dial-peer voice 4 pots
application MGCPAPP
port 1/0/3
You need the folowing software on the 3640 to support the card:
Cisco IOS Software Releases 12.2(2)XT, 12.2(8)T, 12.2(11)YT, 12.2(15)ZJ, 12.3(1), 12.3(2)T
The module requires Cisco IOS Software "Plus" feature set.
Let me know if this works.
RG