Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator's Guide for MGCP (version 3.0) - MGCP Call Flows [Cisco ATA 180 Series Analog Telephone Adaptors]

Table Of Contents

MGCP Call Flows

MGCP Call Flows

This section shows and describes a call flow for a successful call using the Cisco ATA and MGCP.

Note The term Cisco ATA refers to both the Cisco ATA 186 and the Cisco ATA 188, unless otherwise stated.

Figure C-1 illustrates a basic call flow between two Cisco ATAs through a VocalData Call Agent.

Table C-1 describes the action the Cisco ATA takes for each step in the call flow illustration and includes the log created by each step.

Figure C-1 Cisco ATA-to-Cisco ATA Through VocalData Call Agent

Table C-1 Action Log
Step

Action

Log
1.

Cisco ATA 1 goes off-hook—Cisco ATA 1 to Call Agent
NTFY 16 aaln/1@[192.168.2.45] MGCP 1.0 
N: 192.168.3.76:2427 
X: 10 
O: L/hd
K: 15 
2.

OK—Call Agent to Cisco ATA 1
200 16 OK 
3.

An inactive connection is created on Cisco ATA 1—Call Agent to Cisco ATA 1
crcx 57698 aaln/1@[192.168.2.45] MGCP 
1.0 
K: 57687 
C: 26962 
X: 29620 
N: 192.168.3.76:2427 
L: p:10-20, a:PCMU;G729 
M: inactive
4.

OK—Cisco ATA 1 to Call Agent
200 57698 OK 
I: 0 
v=0 
c=IN IP4 192.168.2.45 
m=audio 10000 RTP/AVP 0 18
5.

Cisco ATA 1 gets dial tone—Call Agent to Cisco ATA 1
rqnt 57699 aaln/1@[192.168.2.45] MGCP 1.0 
K: 57698 
X: 29621
R: L/hu(N),L/hf(N),D/[0-9*#](N) 
S: L/dl 
D: x
6.

OK—Cisco ATA 1 to Call Agent
200 57699 OK
7.

Cisco ATA 1 dials `1'—Cisco ATA 1 to Call Agent
NTFY 17 aaln/1@[192.168.2.45] MGCP 1.0
N: 192.168.3.76:2427
X: 29623
O: D/1
K: 16
8.

OK—Call Agent to Cisco ATA 1
200 17 OK 
9.

Dial tone stops playing on ATA 1—Call Agent to Cisco ATA 1
rqnt 57707 aaln/1@[192.168.2.45] MGCP 1.0
K: 57700-57701
X: 29629
R: L/hu(N),L/hf(N),D/[0-9*#](N)
S: 
D: x
10.

OK—Cisco ATA 1 to Call Agent
200 57707 OK
11.

Cisco ATA 1 dials `0'—Cisco ATA 1 to Call Agent
NTFY 18 aaln/1@[192.168.2.45] MGCP 1.0
N: 192.168.3.76:2427
X: 29629
O: D/0
K: 17
12.

OK—Call Agent to Cisco ATA 1
200 18 OK
13.

Cisco ATA 1 dials `2'—Cisco ATA 1 to Call Agent
NTFY 19 aaln/1@[192.168.2.45] MGCP 1.0
N: 192.168.3.76:2427
X: 29629
O: D/2
K: 18
14.

OK—Call Agent to Cisco ATA 1
200 19 OK 
15.

Cisco ATA 1 dials "6"—Cisco ATA 1 to Call Agent
NTFY 20 aaln/1@[192.168.2.45] MGCP 1.0
N: 192.168.3.76:2427
X: 29629
O: D/6
K: 19
16.

OK—Call Agent to Cisco ATA 1
200 20 OK 
17.

Cisco ATA 2 phone rings and displays Cisco ATA 1 ID on CID device—Call Agent to Cisco ATA 2
rqnt 57713 aaln/1@[192.168.3.33] MGCP 1.0
K: 57676
X: 10
S: 
L/rg,L/ci(11/13/12/42,9723301011,ATA-2-45
-USER1)
18.

OK—Cisco ATA 2 to Call Agent
200 57713 OK
19.

Cisco ATA 1 gets ringback tone and dialed number and name displayed on CID device—Call Agent to Cisco ATA 1
rqnt 57714 aaln/1@[192.168.2.45] MGCP 1.0
K: 57707
X: 29630
R: L/hu(N),L/hf(N),D/[0-9*#](N)
S: 
G/rt,L/ci(11/13/12/42,9723301026,ATA-3-33
-USER1)
D: x
20.

OK—Cisco ATA 1 to Call Agent
200 57714 OK
21.

Cisco ATA 2 goes off-hook—Cisco ATA 2 to Call Agent
NTFY 18 aaln/1@[192.168.3.33] MGCP 1.0
N: 192.168.3.76:2427
X: 10
O: L/hd
K: 17
22.

OK—Call Agent to Cisco ATA 2
200 18 OK
23.

An inactive connection is created on Cisco ATA 2—Call Agent to Cisco ATA 2
crcx 57722 aaln/1@[192.168.3.33] MGCP 1.0
K: 57713
C: 26962
X: 29640
N: 192.168.3.76:2427
L: p:10-20, a:PCMU;G729
M: inactive
24.

OK—Cisco ATA to Call Agent
200 57722 OK
I: 0
v=0
c=IN IP4 192.168.3.33
m=audio 10000 RTP/AVP 18 0
25.

Ringing stops on Cisco ATA 2—Call Agent to Cisco ATA 2
rqnt 57723 aaln/1@[192.168.3.33] MGCP 1.0
X: 29641
R: L/hu(N),L/hf(N),D/[0-9*#](N)
S: 
D: x
26.

OK—Cisco ATA 2 to Call Agent
200 57723 OK 
27.

Routing Update Protocol (RTP) Media stream is now enabled on Cisco ATA 2—Call Agent to Cisco ATA 2
mdcx 57724 aaln/1@[192.168.3.33] MGCP 1.0
C: 26962
I: 0
X: 29642
R: L/hu(N),L/hf(N),D/[0-9*#](N)
S:
D: x
N: 192.168.3.76:2427
L: p:20, a:PCMU, t:00
M: sendrecv
v=0
c=IN IP4 192.168.2.45
m=audio 10000 RTP/AVP 0
28.

OK—Cisco ATA 2 to Call Agent
200 57724 OK 
29.

Ringback stops on Cisco ATA 1—Call Agent to Cisco ATA 1
rqnt 57725 aaln/1@[192.168.2.45] MGCP 1.0
K: 57714
X: 29643
R: L/hu(N),L/hf(N),D/[0-9*#](N)
S: 
D: x
30.

OK—Cisco ATA 1 to Call Agent
200 57725 OK 
31.

RTP Media stream is now enabled on Cisco ATA 1. Both Cisco ATA 1 and Cisco ATA 2 can communicate with each other—Call Agent to Cisco ATA 1
mdcx 57726 aaln/1@[192.168.2.45] MGCP 1.0
C: 26962
I: 0
X: 29644
R: L/hu(N),L/hf(N),D/[0-9*#](N)
S: 
D: x
N: 192.168.3.76:2427
L: p:20, a:PCMU, t:00
M: sendrecv
v=0
c=IN IP4 192.168.3.33
m=audio 10000 RTP/AVP 0
32.

OK—Cisco ATA1 to Call Agent
200 57726 OK 
33.

Cisco ATA 1 hangs Up—Cisco ATA 1 to Call Agent
NTFY 21 aaln/1@[192.168.2.45] MGCP 1.0
N: 192.168.3.76:2427
X: 29644
O: L/hu
K: 20
34.

OK—Call Agent to Cisco ATA 1
200 21 OK
35.

Cisco ATA 1 Connection is deleted—Call Agent to Cisco ATA 1
dlcx 57735 aaln/1@[192.168.2.45] MGCP 1.0
K: 57725-57726
C: 26962
I: 0
X: 29651
S:
N: 192.168.3.76:2427
36.

OK—Cisco ATA 1 to Call Agent
200 57735 OK
37.

Call Agent requests Cisco ATA 2 to report off-hook event—Call Agent to Cisco ATA2
rqnt 57736 aaln/1@[192.168.2.45] MGCP 1.0
X: 29652
R: L/hd(N)
N: 192.168.3.76:2427
38.

OK—Cisco ATA 1 to Call Agent
200 57736 OK
39.

ATA 2 Connection mode changes to receive-only—Call Agent to Cisco ATA 2
mdcx 57737 aaln/1@[192.168.3.33] MGCP 1.0
K: 57722-57724
C: 26962
I: 0
X: 29653
R: L/hu(N),L/hf(N),D/[0-9*#](N)
S: 
D: x
N: 192.168.3.76:2427
L: p:20, a:PCMU, t:00
M: recvonly
v=0
c=IN IP4 192.168.3.33
m=audio 10000 RTP/AVP 0
40.

OK—Cisco ATA 2 to Call Agent
200 57737 OK
41.

Cisco ATA 2 hangs up—Cisco ATA 2 to Call Agent
NTFY 19 aaln/1@[192.168.3.33] MGCP 1.0
N: 192.168.3.76:2427
X: 29653
O: L/hu
K: 18
42.

OK—Call Agent to Cisco ATA 2
200 19 OK
43.

Cisco ATA 2 Connection is deleted—Call Agent to Cisco ATA 2
dlcx 57740 aaln/1@[192.168.3.33] MGCP 1.0
K: 57737
C: 26962
I: 0
X: 29654
S: 
N: 192.168.3.76:2427
44.

OK—Cisco ATA 2 to Call Agent
200 57740 OK
45.

Call Agent requests Cisco ATA 2 to report off-hook event—Call agent to Cisco ATA 2
rqnt 57741 aaln/1@[192.168.3.33] MGCP 1.0
X: 29655
R: L/hd(N)
N: 192.168.3.76:2427
46.

OK—Cisco ATA 2 to Call Agent
200 57741 OK 