tos=0xb8 will set the the packet to be DSCP EF (Cisco likes to use DSCP)
Rich Adamson wrote:
Does anyone know how setting the TOS bits in iax.conf corresponds to the Cisco TOS types?
For example, if I set:
tos=0x04
in iax.conf, and on the Cisco, I use:
access-list 110 permit ip any any tos 4
I can't get the Cisco to match any packets. I've tried various combinations of numbers on both asterisk and the cisco. I've also tried hex to decimal conversion. I just can't get the Cisco to see the TOS bits that I set in iax.conf.
Here's what I'm using.
sip.conf:
tos=0x18 ;lowdelay ;sets ip tos bits (=lowdelay, throughput) iax.conf:
tos=lowdelay
Cisco: class-map match-all voice-rtp match access-group 103
access-list 103 permit ip any any tos min-delay access-list 103 permit ip any any tos 12
C1750#show access-list 103 Extended IP access list 103 permit ip any any tos min-delay (2077271 matches) permit ip any any tos 12 (651833 matches)
The NAI Sniffer does a better job of showing the bits. Here's two samples for the above:
sip packet (tos=0x18): IP: Type of service = 18 IP: 000. .... = routine IP: ...1 .... = low delay IP: .... 1... = high throughput IP: .... .0.. = normal reliability IP: .... ..0. = ECT bit - transport protocol will ignore the CE bit IP: .... ...0 = CE bit - no congestion
iax packet (tos=lowdelay): IP: Type of service = 10 IP: 000. .... = routine IP: ...1 .... = low delay IP: .... 0... = normal throughput IP: .... .0.. = normal reliability IP: .... ..0. = ECT bit - transport protocol will ignore the CE bit IP: .... ...0 = CE bit - no congestion
Study the above and the bits become very clear. :)
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