[Asterisk-Dev] IAX2 trunk really should send timestamps as part of iax2_meta_trunk_entry..

[Steve Underwood]

steve at daviesfam.org wrote:

>On Fri, 4 Feb 2005 steve at daviesfam.org wrote:
>
>  
>
>>In my mind we'll only ever get dejittering and the trunking code to play 
>>nicely once the trunking code gives each enclosed frame its own timestamp.
>>    
>>
>
>
>Hmmm - I did think of a hack that might fix this issue without having to 
>have a timestamp for EVERY enclosed frame - which is to just send the 
>timestamp for the FIRST frame.
>
>The trunk frame either all arrives or none.  By comparing the one received 
>timestamp with the last received for that channel we can get an offset and 
>use that offset to recover the timestamps for all the other frames in the 
>trunk frame.
>
>Wouldn't that work? (it was a half-asleep brainwave - so don't shoot me if 
>its dumb!)
>
>Steve
>  
>
Think plesiochronous :-) [if you don't know what that means, look it 
up]. T1s and E1s come from the days of plesiochronous telecoms (PDH - 
the plesiochronous digital heirarchy). SDH - the synchronous digital 
heirarchy - replaced that, and the complexity of multiplexing and 
demultiplexing dropped dramatically.

What goes into an IAX trunk packet is a bunch of plesiochronous streams. 
They each have their own timing. A common timestamp for the whole group 
doesn't cut it.

Regards,
Steve