[Asterisk-Users] configuring sample time period for codecs?

[Roy Sigurd Karlsbakk]

> how can I configure the sample time period (10ms,20ms etc) for codecs?

kapejod told me on IRC that this could not be achived with 
configuration, and that I needed to dig into the source to do this.

Can someone please tell me what asterisk normally uses here?

Should the client setting always match asterisk's sample period, or 
will this be handled by the codec(s), if so, which?

thanks

roy