Bizfon 7000 User's Guide download pdf (Page 52)

System Administration Guide Remote IP Phone

50 Stiles Road • Salem, NH 03079 • Toll Free 1-800-260-5793 • 603-870-9400 • www.Bizfon.com

Revised: August 5, 2005 Page 48

There are reasons why having a bigger range than absolutely necessary is good. However, when you

have to manually map the ports through a firewall, you’ll want to dramatically reduce the large default

range to something you are willing to type into your firewall configuration. A suitable number would be

10 ports.

Modify the Phone Options to change the RTP Media Port Range parameter to reduce the maximum

range.

The second step is to modify the NAT firewall configuration. You want to one-to-one map each of the RTP

ports through the firewall such that packets arriving at those ports on the firewall’s WAN interface are

routed to the phone that is inside the NAT firewall. The directions for doing this are unique to each NAT

firewall product and therefore beyond the scope of this description.

3. Internet Telephony Service Provider (ITSP) services configured on the Bizfon server may not be accessible

from remote phones that are behind NAT firewalls.

Solution:

Statically map (one to one) the remote phone’s RTP ports through the NAT firewall. This requires the

same two steps as described in limitation 2 above.

12.4 Remote Non-Bizfon IP2 Phone

In addition to support for the Bizfon IP2 phone, the Bizfon server supports other remote SIP phones as well.

Steps for configuring these are unique to each phone model and brand.

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Bizfon 7000 User's Guide Page 52