Please note:

–You should only deactivate codecs (put them in the Available codecs list) if there is a particular reason. The more codecs that are deactivated, the greater the danger that calls will not be able to be established due to unsuccessful codec negotiations.

–With incoming calls, all supported voice codecs are always permitted.

Area: Settings for Codecs

To save additional bandwidth and transmission capacity, on VoIP connections that use codec G729 you can suppress the transmission of voice packets in pauses ("Silence Suppression"). Then, instead of the background noises in your environ- ment, your caller hears a synthetic noise generated in the receiver.

Please note: "Silence Suppression" can sometimes lead to deterioration in the voice quality.

¤In the Enable Annex B for codec G729 field, state whether, when using codec G729, transmission of data packets for pauses is to be suppressed (activate Yes option).

Saving settings on the phone

¤Click on the Set button to save the set- tings for the voice quality.

Please note:

You should observe the following for good voice quality:

–When making calls using VoIP, avoid per- forming other Internet activities

(e.g. surfing the net).

–Irrespective of the codec used and the net- work capacity utilisation, please note that voice delays can occur. Therefore, allow your VoIP calling partner to finish speaking. Avoid interrupting your calling partner.

Web configurator

Voice quality and infrastructure

With your Gigaset S450 IP you have the opportunity to make calls with good voice quality via VoIP.

However, your phone's performance with VoIP – and therefore the voice quality – also depends on the properties of the entire infrastructure.

The following VoIP provider components are just some of the things that can influence performance:

uRouter u DSLAM

u DSL transmission line and speed u Connection paths over the Internet

uIf necessary, other applications that also use the DSL connection

In VoIP networks, the voice quality is influenced by various things including the "quality of service" (QoS). If the entire infrastructure demonstrates QoS, voice quality is better (fewer delays, less echo- ing, less crackling etc.).

If, for example, the router does not have QoS, then the voice quality is not as good. Please see the specialist documentation for further information.

Assigning sending and receiving numbers to handsets

Your phone can be assigned up to seven phone numbers: the fixed network number and up to six VoIP phone num- bers.

You can assign these numbers to the individual handsets that are connected to your base station as receiving and sending numbers. The means that for each hand- set, you define the calls that it will ring for, and which VoIP account (sending number) is used by your VoIP provider to calculate outgoing VoIP calls.

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