Defining local communication ports for voip, Defining dialling plans, See defining dialling plans – Siemens Gigaset C450IP User Manual

Page 65

Web configurator

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Defining local communication
ports for VoIP

Open the following Web page:

Settings

Telephony

Advanced Settings

In the

Listen Ports for VoIP Connections

area,

specify which local ports the telephone is

to use for VoIP telephony. The ports must

not be used by any other subscriber in the

LAN.

SIP port

Specify the local communication port

that the phone should use to send and

receive signalling data. Specify a

number between 1024 and 49152. The

default port number for SIP signalling is

5060.

RTP port

Specify the local communication port

that the phone should use to send and

receive voice data. Enter an even

number between 1024 and 49152. The

port number must not be the same as

the port number in the

SIP port

field.

If you enter an odd number, the even

number just below it will be set

(e.g. if you enter 5003, 5002 is set).

The default port number for voice

transmission is 5004.

Use random ports

Click on the

Yes

option if you do not

want the phone to use fixed ports for

SIP port

and

RTP port

, but rather to use

any free ports.
The use of random ports makes sense if

you want several phones to be oper-

ated on the same router with NAT. The

phones must then use different ports

so that the router's NAT is only able to

forward incoming calls and voice data

to one (the intended) phone.
If you click on

, the phone will use

the ports specified in

SIP port

and

RTP

port

Now click on

Set

to save your settings.

Defining dialling plans

You can define user-specific dialling plans

for your phone.

Open the following Web page:

Settings

Telephony

Dialing Plans

Setting Area Code Predialling:

In VoIP calls you must generally always

dial the area code – even for local calls.
You can save the annoying need to dial the

area code for local calls by activating the

Area Code Predialling

function. In VoIP calls,

the area code entered is then prefixed to

all numbers that do not start with 0 – even

when dialling numbers from the directory

and other lists.

Enter your area code in the

Area Code

field, e.g. 089.

Click on the

Yes

option next to

Predial

area code for local calls through VoIP

activate the function.
If you click on

you must enter the

area code even for local calls via VoIP.

Numbers in the directory must always

contain the area code for dialling via

VoIP.

Click on

Set

to save the settings.

Please note that if the option is activated, the

area code is prefixed to all phone numbers that

do not start with 0 and are dialled via VoIP.

This is especially the case for numbers of the

network answer machine (page 38) and,

if the

Emergency calls always via fixed line

option

is deactivated (see below), for emergency

numbers.