Dynamic QOS support with asterisk

I want to enable the DQOS(Dynamic quality of service) on asterisk.Can anybody help me in enabling this
support and version which supports this functionality.any kind of help would be greatly appreciated.
The sample CRCX command which supports DQOs is that the “dq-gi” parameter is added in CRCX command.

CRCX 1206 aaln/1@rgw-2569.whatever.net MGCP 1.0 NCS 1.0
K: 1205
C: A3C47F21456789F0
L: p:10, a:PCMU, dq-gi:A735C2
M: inactive
o=- 25678 753849 IN IP4
c=IN IP4
t=0 0
m=audio 3456 RTP/AVP 0 18
a=mptime:10 10