Both NetMeeting and OpenH323 can interoperate with Cisco's
voice capable routers. To successfully initiate calls from
a Cisco to an OpenH323 (i.e, Linux) client, the G.711 codec
must be explicitly specified. For example, with the following
configuration, dialing "911" on the Cisco will place a call
to a Linux system (10.1.1.1) running OpenH323:
dial-peer voice 911 voip
destination-pattern 911
session target ipv4:10.1.1.1
codec g711ulaw
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To call from Linux to a Cisco, use ohphone
with a number@host argument. number
should be a phone number that's been configured on the Cisco
using a dial-peer statement. For example,
this will call number "111" on a Cisco (10.1.1.10):
bash$ ohphone -n 111@10.1.1.10
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To call from NetMeeting to a Cisco, select the Cisco as a gateway.
To do this from NetMeeting, select
->.
For NetMeeting 2, select
Audio, check the box labeled "Use H.323 gateway", and
enter the Cisco's DNS or IP address.
For NetMeeting 3, select
General+Advanced Calling..., check the box labeled "Use a gateway..."
(not gatekeeper) and enter the Cisco's address.
Now, you can type a phone number directly into NetMeeting's address
panel and it will be relayed to the Cisco and resolved there, using
the Cisco's configured dialing rules.
If you're using NetMeeting 2, you'll need to select
"H.323 Gateway" from the "Call using:" list when you initiate the call.