Configuring Voip Trunk Media Parameters - Nortel BCM50 Configuration Manual

382 Chapter 44 Configuring VoIP trunk gateways
— If your network uses a gatekeeper (H.323 trunks only), there are also specific settings
that must be set on the your system to recognize the gatekeeper, and also within the
gatekeeper application, so that VoIP lines are recognized. Refer to
interoperability: Gatekeeper configuration" on page
the network, you do not have to configure remote gateway settings.
— 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.
• SIP network applications consideration:
— If you plan to use SIP trunking, and you have a firewall set up, ensure that the ports
you intend to use have been allowed.
"Using VoIP to tandem systems" on page
network" in the Device Configuration Guide (NN40020-300).

Configuring VoIP trunk media parameters

The VoIP trunk media parameters allow you to specify the order in which the trunk will select IP
telephony system controls for codecs, jitter buffers, silence suppression and payload size.
The following path indicates where to access the VoIP trunk media parameters in Element
Manager:
• Element Manager: Configuration > Resources > Telephony Resources > IP Trunks
For details about the fields on this panel, refer to
Media Parameters" on page
1 On the Modules panel, in the Module type column, select the IP Trunks line.
2
In the bottom panel, select the H323 or SIP Media Parameters tab.
3
Enter the information that supports your system. Ensure that these settings are consistent with
the other systems on the network:
• Preferred Codecs: Choose codecs in the same order for all remote equipment.
• Settings:
— Enable Voice Activity Detection: Disable or enable this feature, based on network
requirements. Also refer to
— Jitter buffer - Voice: Either choose auto to let the system determine resource
availability, or choose a buffer size.
— Payload Size: Change the defaults to coordinate with other systems on the network.
Operations note: Fax tones that broadcast through a telephone speaker may disrupt calls at other
telephones using VoIP trunks in the vicinity of the fax machine. Here are some suggestions to
minimize the possibility of your VoIP calls being dropped because of fax tone interference:
— Locate fax machine away from other telephones.
— Turn the speaker volume on the fax machine to the lowest level, or off, if that option is
available.
NN40020-603 NN40020-603
327, and "Configuring fallback over a VoIP MCDN
"H323 Media Parameters" on page 122
126.
"Silence suppression" on page
"VoIP
389. If there is a gatekeeper on
529.
and "SIP