
Chapter 5 Configuring local VoIP trunks 87
IP Telephony Configuration Guide
If you plan to use H.323 trunking and you have a firewall set up, ensure that the ports you intend to
use have been allowed. Refer to “Incoming calls: Assigning target lines” on page 98.
Chapter 8, “Typical network applications using MCDN,” on page 147 provides examples of VoIP
trunks used in private networking.
Counting IP trunks
After you enter the keycodes for your VoIP trunks, you need to specify how many of the trunks
will be used for H.323 trunking and how many for SIP trunking. Once these parameters are set,
you can go to Line programming (Services, Telephony Services) to determine the parameters for
each line, including assigning line pools for each type of trunk so that you can configure the
routing. You must also assign the H.323 or SIP line pools to each telephone that you want to be
able to call out over the lines.
Since H.323 trunks and SIP trunks use the same pool of available lines (001 to 060), you can use
the IP Trunks Settings screen to keep track of the total number of enabled trunks and how they are
distributed between H.323 and SIP trunks.
Determining the IP trunk count
1 Enter the keycodes that you need to enable enough IP lines for your requirements.
2 In Unified Manager, click the keys beside Services, IP Telephony.
3 Click IP Trunks.
The IP Trunks Settings screen appears.
Figure 22 IP Trunks Settings screen
The first two fields are read-only and are determined by the number of IP trunk keycodes you
have installed on your system.
Warning: Ensure that all systems in your network are either running BCM 3.5 or newer
software or have the QoS patch installed that allows them to interoperate with BCM 3.5 or
newer software. Systems running BCM software previous to 3.5, which do not have this
patch installed, cannot support VoIP trunks with systems running BCM 3.5 or newer
software. If you need more information, contact your technical support service.
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