[asterisk-dev] RTP Payload size definition

[Henri Herscher]

Hi Robert,

RTP payload size for ULAW can theoretically be of any size, there is
no "block" size as for other codecs like G.729 or G.723. Every one 16
bit PCM sample is translated into an 8 bit ULAW/ALAW value.

So quite easily, if the packet transports 20 ms of audio, the packet
size will be 8000 samples per second * 0.02 second * 1 byte per
encoded PCM sample - 160 bytes.

For 30 ms packet size, it is 240 bytes.

Cheers
Henri

On 23/01/06, Robert Webb <asterisk at ropeguru.com> wrote:
>
> I have tried deciphering the code myself but cannot quite
> figure it out. Could someone please take a second or two
> to explain to me how the RTP payload size is determined
> for ULAW??
>
> TIA
>
> Robert
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