41
6. If you are using an extension or an alias to place the call to the far-end site, try their
IP address instead. (The people at the far-end site should be able to provide you
with their IP address.)
If you can place the call using the IP address, your H.323 gatekeeper is down or
your access to the gatekeeper is down. Notify your system administrator.
7. Place a telephone call to the far-end site and ask them whether their system is
behind an IP network firewall. If it is, the far-end site must provide a way for LAN
traffic to go through. If they can’t, you cannot make the call.
8. If the far-end site is within your LAN, have your system administrator “ping” the IP
address of the far-end site from an independent IP workstation. If the ping fails, your
site cannot reach the far-end site over the LAN. Contact your network provider. If
the ping responds fine, the LAN connection from your site to the far-end site is okay.
If you still can’t call another LAN site, contact your system administrator.