Siemens gigaset c475 ip User Manual

Web configurator – configuring the telephone via a PC

Gigaset C470-475 IP / EN for IM-Ost / A31008-xxxx-xxxx-x-xxxx / web_server.fm / 18.12.07

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Sort the voice codecs in the 

 list into the order in which they should be 

suggested to the receiving device when a connection is established. To do this, use 

the 

 and 

 buttons. 

When establishing a VoIP connection, the phone suggests the 1st voice codec in the 

 list to the receiving device to begin with. If the receiving device does not 

accept the codec (e.g. because it is not supported), the 2nd voice codec on the list is 

suggested, and so on. 
If the receiving device does not accept any of the voice codecs in the 

 list, 

the connection is not established. An appropriate message will be displayed on the 

handset. 

To save additional bandwidth and transmission capacity, on VoIP connections that use 

codec 

 you can suppress the transmission of voice packets in pauses ("Silence Sup-

pression"). Then, instead of the background noises in your environment, your caller hears 

a synthetic noise generated in the receiver.
Please note: "Silence Suppression" can sometimes lead to deterioration in the voice qual-

ity. 

¤

In the 

 field, state whether the transmission of data packets 

during pauses should be suppressed when using the 

 codec, (activate 

). 

¤

Click 

 to save the settings for the voice quality.

A Gigaset C470 IP or C475 IP will allow you to make calls with good voice quality via the 

Internet. 
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 per-

formance :

u

Router

u

DSLAM 

u

DSL transmission line and speed

– You should only deactivate codecs (put them in the 

 list) if there is a particular rea-

son. 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. 

You should observe the following for good voice quality:
– When making calls using VoIP, avoid performing other Internet activities (e.g. surfing the Inter-

net). 

– Irrespective of the codec used and the network capacity utilisation, please note that voice delays 

can occur.