Description

According to RFC4594

    ------------------------------------------------------------------
   |   Service     |  DSCP   |    DSCP     |       Application        |
   |  Class Name   |  Name   |    Value    |        Examples          |
   |===============+=========+=============+==========================|
   |Network Control|  CS6    |   110000    | Network routing          |
   |---------------+---------+-------------+--------------------------|
   | Telephony     |   EF    |   101110    | IP Telephony bearer      |
   |---------------+---------+-------------+--------------------------|
   |  Signaling    |  CS5    |   101000    | IP Telephony signaling   |
   |---------------+---------+-------------+--------------------------|

Kamailio should relay SIP messages with DCSP value CS5
To set this value I can use in config file

tos=0xA0

This works as expected
But when I use text form this does not work

tos=IPTOS_PREC_CRITIC_ECP

IPTOS_PREC_CRITIC_ECP defined in the /usr/include/linux/ip.h as

#define IPTOS_PREC_CRITIC_ECP           0xa0

I expect both forms 0xA0 and IPTOS_PREC_CRITIC_ECP should works.

Tested on 5.6.2 version


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