Asterisk provides a way to set tos and cos fields <https://wiki.asterisk.org/wiki/display/AST/IP+Quality+of+Service> in IP headers. But as stated in documentation:
Since IAX connections combine signalling, audio, and video into one UDP stream, it is not possible to set the TOS separately for the different types of traffic So the packet priority is assigned to signaling, voice and video; which minimizes the benefit of having packet priority. If there are separate settings for signaling and voice, users can increase priority of signaling; to ensure that control packets get better chance than voice packets. Is this a useful feature? Will it make any difference in IAX connection quality? -- Yousf Ateya -- This e-mail message is intended only for the use of the intended recipient(s). The information contained therein may be confidential or privileged, and its disclosure or reproduction is strictly prohibited. If you are not the intended recipient, please return it immediately to its sender at the above address and destroy it.
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