Nortel BCM50 Installation And Configuration Manual

Also see for BCM50: Configuration guide Installation and maintenance guide Keycode Installation Guide Integration guide Installation and configuration guide

Contents

48 Chapter 5 Registering Nortel 20XX IP telephonesN0027269 01N0027269 01To see the Codec data for a telephone while it is on a call: Press the key, followed by thekey.To troubleshoot operation issuesA few possible issues can encounter. They are explained here, including a description of what maycause them, and how to troubleshoot the issue.Deregistering 20XX IP telephonesYou can deregister selected 20XX IP telephones from the system, and force the telephone to gothrough the registration process again.Table 12 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 was unable toestablish communications with the system. Double-check the IPconfiguration of the telephone, and the IP connectivity to the system(for example cables or hubs).Slow connection between thehandset and the systemIf the connection between the IP client and the system is slow (ISDN,dialup modem), change the preferred codec for the telephone fromG.711 to G.729. See “IP telephone server configurations” on page 45.One-way or no speech paths Signaling between the IP telephones and the system uses the systemport 7000. However, voice packets are exchanged using the defaultRTP ports 28000 through 28255 at the BCM50, and ports 51000through 51200 at the IP telephones. If these ports are blocked by thefirewall or NAT, you will experience one-way or no-way speech paths.Note: Registration must be turned on in the Services, IP Telephony,IP Terminals, Nortel IP Terminals, General page, before thetelephone can access the system to register.Change the contrast level When an IP telephone is connected for the first time, the contrast levelis set to the default setting of 1. Most users find this value is too low.Therefore, after the telephone is installed, use FEATURE *7 and usethe UP or DOWN key to adjust the contrast.Block individual IP sets fromdialing outside the system.If you want to block one or more IP telephones from calling outside thesystem, use Restriction filters and assign them to the telephones youwant to block. Restriction filters are set up under Services, TelephonyServices, Restriction filters.Warning: After this feature is activated, all active calls are dropped.