Nortel BCM50 2.0 Installation Manual

Also see for BCM50 2.0: User guide System overview guide User guide Configuration guide User guide

Contents

Nortel BCM50 2.0 Installation Manual Manual pdf 56 page image

56 Chapter 7 Registering Nortel 20XX and 11XX IP telephonesNN40020-309NN40020-309Operation issuesTable 6 provides solutions to potential problems.Deregistering IP telephonesYou can deregister selected IP telephones from the system, and force the telephone to go throughthe registration process again.To deregister a IP telephone from the IP record1 You can access the deregister button from two locations:• Configuration > Resources > Telephony Resources > IP Terminal Details tab• Telephony > Sets > Active Sets > IP Terminal Details tab2 From the top list, select the IP telephone that you want to deregister.3 Click Deregister DN.4 Reregister the telephone, as described in “Determining the registration process” on page 49.Table 6 IP telephone troubleshootingProblem Suggested solution or causeTelephone does not connect tosystemIf an IP telephone does not display the text Connecting to serverwithin two minutes after power up, the telephone did not establishcommunications with the system. Double-check the IP configuration of thetelephone and the IP connectivity to the system (cables, hubs, and so on).Slow connection between thehandset and the systemIf the connection between the IP client and the system is slow (ISDN, dialupmodem), change the preferred CODEC for the telephone from G.711 to G.729.See Table 4.One-way or no speech pathsSignaling between the IP telephones and the system uses the system port7000. However, voice packets are exchanged using the default RTP ports28000 through 28255 at the BCM50, and ports 51000 through 51200 at the IPtelephones. If these ports are blocked by the firewall or NAT, you willexperience one-way or no-way speech paths.Change the contrast levelWhen an IP telephone is connected for the first time, the contrast level is set tothe default setting of 1. Use FEATURE *7 and the UP or DOWN key to adjustthe contrast.Block individual IP sets fromdialing outside the system.If you want to block one or more IP telephones from calling outside the system,use Restriction filters, and assign them to the telephones you want to block.Restriction filters are set up under Telephony > Call Security > RestrictionFilters.Warning: After this feature is activated, all active calls are dropped.Warning: After this feature is activated, all active calls are dropped.