Avaya IP Telephony Guía de configuración descargar pdf (Pagina 52)

52 Chapter 3 Installing IP telephones

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To see the Codec data for a telephone while it is on a call: Press the key, followed by the

key.

Operation issues

Here are a few possible issues you may encounter, including a description of what may cause

them, and how to troubleshoot the issue.

Table 14 IP telephone troubleshooting

Problem Suggested solution or cause

Telephone does not connect to

system

If an IP telephone does not display the text Connecting to server

within two minutes after power up, the telephone was unable to

establish communications with the Business Communications

Manager. Double check the IP configuration of the telephone, and the

IP connectivity to the Business Communications Manager (cables,

hubs, etc.).

Slow connection between the

handset and the Business

Communications Manager

If the connection between the IP client and the Business

Communications Manager is slow (ISDN, dialup modem), change the

preferred CODEC for the telephone from G.711 to G.729. See “IP

telephone server configurations” on page 49.

One-way or no speech paths

Signaling between the IP telephones and the Business

Communications Manager uses Business Communications Manager

port 7000. However, voice packets are exchanged using the default

RTP ports 28000 through 28255 at the Business Communications

Manager, and ports 51000 through 51200 at the IP telephones. If these

ports are blocked by the firewall or NAT, you will experience one-way

or no-way speech paths.

Firewall note: If you have the firewall filter set to Pass Outgoing and

Block Incoming Except IP Phones, this only allows IP telephony

registration traffic through, but blocks all other traffic, including H.323

calls on this interface. You must still specify an H.323 rule to allow IP

call voice traffic. Also, Registration must be turned on in the Services,

IP Telephony, IP Terminals, Nortel IP Terminals, General page,

before the telephone can access the system to register.

Change the contrast level

When an IP telephone is connected for the first time, the contrast level

is set to the default setting of 1. Most users find this value is too low.

Therefore, after the telephone is installed, use FEATURE *9 and use

the

UP or DOWN key to adjust the contrast.

Block individual IP sets from

dialing 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 Services, Telephony

Services, Restriction filters. Restriction filters are discussed in the

Programming Operations Guide.

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