368 Chapter 43 VoIP trunk gatewaysNN40020-603NN40020-603KeycodesBefore you can use VoIP, you must obtain and install the necessary keycodes. See the KeycodeInstallation Guide (NN40010-301) for more information about installing the keycodes. Talk toyour BCM sales agent if you need to purchase VoIP keycodes.Each keycode adds a specific number of VoIP trunks. To activate trunking, you must reboot yourBCM after you enter VoIP keycodes.If you want to use the MCDN features on the VoIP trunks, you will need an MCDN keycode. Ifyou have already deployed MCDN for your SL-1 PRI lines, you do not require an additionalkeycode.H.323 network applications considerationsIn order to maintain a level of quality during call setup, QoS monitor must be enabled andconfigured.If your network uses a gatekeeper (H.323 trunks only), there are also specific settings that must beset on the H323 Settings panel to recognize the gatekeeper, and also within the gatekeeperapplication, so that VoIP lines are recognized. Also refer to gatekeeper configuration “VoIPinteroperability: Gatekeeper configuration” on page 389.If you plan to use H.323 trunking and you have a firewall set up, ensure that the ports you intend touse have been allowed.SIP network applications considerationsIn order to maintain a level of quality during call setup, QoS monitor must be enabled andconfigured.SIP URI maps of both endpoints must match.If you plan to use SIP trunking and you have a firewall set up, ensure that the ports you intend touse have been allowed.How VoIP trunks make a networkFigure 112 shows a simple private networking configuration of three systems connected by VoIPtrunks. As in all private networking, each system has direct routing configurations to the directlyadjacent systems. As well, the dialing plans are configured to ensure that remote calls are correctlyrouted to the receiving system, such as, if Node A called someone in Node C.
