Specifications

Chapter 4 - MGCP Protocol Features MGCP Conference Mode
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Mediatrix 4100
There are many possible ways to setup a conference. However, you must follow one simple rule: at any point
in time, there must be a maximum of two connections on the same endpoint. Only one of these two
connections can be active and the other one must be set to inactive.
The following is a call flow of a conference.
Figure 23: Conference Message Flow – Part 1
Note: The PCMU or PCMA codec must be enabled to use the Conference mode. See “Enabling Individual
Codecs” on page 136 for more details.
RM: restart
X: 100
R: L/hd
D: (x)
Q: discard
X: 100
O: L/hd
C: 1
M: inactive
R: G/ft(N),G/mt(N)
S:
X: 101
I: 483408420
v=0
o=MGCP 0 0 IN IP4 10.2.128.16
s=MGCP Call
c=IN IP4 10.2.128.16
t=0 0
m=audio 5004 RTP/AVP 0 18 4 8 13
MGC
Port 2727
X: 102
S: dl
R: L/hu(N),L/hf(N),D/[0-9*#](D)
Q: discard
X: 102
O: D/2
C: 1
M: inactive
R: G/ft(N),G/mt(N),L/hd(N)
S: L/rg
X: 103
I: 778951432
v=0
o=MGCP 0 0 IN IP4 10.2.128.16
s=MGCP Call
c=IN IP4 10.2.128.16
t=0 0
m=audio 5006 RTP/AVP 0 18 4 8 13
X: 104
S: G/rt
R: L/hu(N), L/hf(N), D/[0-9*#](D)
Q: discard
X: 103
O: L/hd
C: 1
I: 778951432
M: sendrecv
R: G/ft(N),G/mt(N),L/hu(N)
S:
X: 105
RSIP 161919941 *@rush.mediatrix.com MGCP 1.0
200 161919941 OK
RQNT 2 *@rush.mediatrix.com MGCP 1.0
200 2 OK
NTFY 522191979 aaln/[e-mail] MGCP 1.0
200 522191979 OK
CRCX 4 aaln/[e-mail] MGCP 1.0
200 4 OK
RQNT 5 aaln/[e-mail] MGCP 1.0
200 5 OK
NTFY 522191980 aaln/[e-mail] MGCP 1.0
200 522191980 OK
CRCX 7 aaln/[e-mail] MGCP 1.0
200 7 OK
RQNT 8 aaln/[e-mail] MGCP 1.0
200 8 OK
NTFY 609349239 aaln/[e-mail] MGCP 1.0
200 609349239 OK
MDCX 10 aaln/[e-mail] MGCP 1.0
200 10 OK
v=0
o=MGCP 0 0 IN IP4 10.2.128.16
s=MGCP Call
c=IN IP4 10.2.128.16
t=0 0
m=audio 5004 RTP/AVP 0 18 4 8 13
C: 1
I: 483408420
M: sendrecv
S:
X: 106
MDCX 11 aaln/[e-mail] MGCP 1.0
200 11 OK
v=0
o=MGCP 0 0 IN IP4 10.2.128.16
s=MGCP Call
c=IN IP4 10.2.128.16
t=0 0
m=audio 5006 RTP/AVP 0 18 4 8 13
User A User B User C