[asterisk-users] QOS/DSCP for IAX?

[Dave Fullerton]

Michelle Dupuis wrote:
> I actually see the TOS setting in iax.conf, but the default (commented out)
> is EF - which doesn't even match a valid bit combination according to
> voip-info wiki
>  
> If this is the right place, what TOS value are people using succesfully over
> an ADSL connection?
> 
>   _____  
> 
> From: asterisk-users-bounces at lists.digium.com
> [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Michelle
> Dupuis
> Sent: Thursday, October 01, 2009 2:27 PM
> To: Asterisk Users List
> Subject: [asterisk-users] QOS/DSCP for IAX?
> 
> 
> Is it possible to set QOS/COS/DSCP on IAX packets?  I see some parameters in
> sip.conf but not iax.conf
>  
> Thanks

Yes the tos setting is the right place and EF is an acceptable value. EF 
is the differentiated services code point (or dscp) for expedited 
forwarding. The sample sip.conf defaults tos_audio to EF as well. The 
iax.conf wiki page only shows the old type of service values which are 
considered deprecated. Look at this page for more info on diffserv:

http://www.voip-info.org/wiki/view/DiffServ

As for what to use, well, that depends on whether your upstream provider 
even honors what you set. They may use the old type of service values, 
they may use dscp or they may ignore what you put there entirely.

-Dave