[Asterisk-Dev] IAX2 RFC and retries.

[Steve Kann]

tim panton wrote:

> I am implementing the IAX2 protocol in pure Java.
> I am trying to use the RFC as a protocol description
> - not the code!
>
> The good news is that I have a usable phone with acceptable
> performance if I am on a quiet LAN.
>
> However....
> I am now trying to implement the retry mechanism for full frames.
> I can't get it to work right against asterisk 1.0.3
> The RFC says:
>
> An ACK must have both a source
> call number and destination call number. It must also increment
> the sequence number counters, and return the same timestamp it
> received. This allows the originating peer to determine to which
> message the ACK is responding.
>
> But this seems not to be the case. I am seeing acks with timestamps
> that are the time they were sent, not that of the original message.
>
> Before I rip my code apart again, could someone tell me if the
> RFC represents what Asterisk 1.0.3 actually does ?


The timestamp of an ACK really is meaningless; It's the seqno that tells 
the receiver what has been acknowledged.

I think that asterisk _does_ set the timestamp of an ACK to be equal to 
the timestamp of the frame it's acknowledging, but it's redundant.

-SteveK