Hi Don,
I'm afraid that's rather a large question!
If you just want to turn it on in Asterisk, look at the top of your
sip.conf for a sample entry
tos=lowdelay
This sets a predetermined hex value in the IP packet ToS field.
You can customize this value to your favourite 2-digit hex number with,
for example,
tos=0xb8
to set it to an arbitrary value of your choice. Simple enough so far?
What happens to the packet now that you've set these values to "Send my
packet really fast and don't mess around"?
Usually, absolutely nothing.
The tricky bit is getting each and every one of the network components
between here and there to respect and act on those values. You can
control the devices on your own network but once you hit the Internet,
forget it.
Best you can do is set up your own routers and switches to prioritize
packets with given ToS values. This may help a little on Internet and
WAN links but won't do much on the typical SOHO to midsize LAN (yes,
there are exceptions).
You can search for ToS, CoS and QoS on voip-info.org and Google, be
prepared for a whole pile of confusing and contradictory information.
regards,
Drew
PS. If you're still keen, tcpdump and/or Wireshark will let you view the
packets Tos/CoS values
Don Moskaluk wrote:
In the last few months I have been testing out a few Wireless SIP phones
that are similar to today's cell phones i.e. long battery life and many
features. All the models have a RTP TOS and I was wondering how you set
Asterisk to for TOS? Now the phones have a 2 digit hex number. I am
getting very little support from the companies engineer as they
indicated that Asterisk should have these numbers. I believe they do
but no in a two digital HEX. Can some put clarity of how to use TOS
with Asterisk?
Don Moskaluk
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