A conference call is placed between two IP phones with extensions 1003 and 80886, and an analog phone with an extension 80900. The IP phone with extension 1003 connects to the analog phone with an extension 80900. The conference function of the IP phone with an extension 1003 is used to add the IP phone with an extension 80886 to the conference.

During the call, the system runs the following commands:

//to display the RTP sessions:
Gxxx-001(super)# show rtp sessions
ID    QoS Start date and time End Time Type            Destination
----- --- ------------------- -------- --------------- ---------------
00001     2015-08-23,09:55:17        -            G729 16.16.16.101
00002     2015-08-23,09:55:20        -           G711U 149.49.41.50
//to display details of session 1:
Gxxx-001(super)# show rtp detailed 1
Session-ID: 1
Status: Active, QOS: Ok, EngineId: 0
Start-Time: 2015-08-23,09:55:17, End-Time: -
Duration: 00:00:48
CName: gwp@33.33.33.33
Phone: 1401
:80900:1003
Local-Address: 33.33.33.33:61999 SSRC 3585271811
Remote-Address: 16.16.16.101:61999 SSRC 1369159108 (0)
Samples: 9 (5 sec)
Codec:
G729 40B 0mS Off, Silence-suppression(Tx/Rx) No-RTP/No-RTP, Play-Time 4.760sec,
Loss 0.0% #0, Avg-Loss 0.8%, RTT 137mS #0, Avg-RTT 141mS, JBuf-under/overruns 0.
8%/0.0%, Jbuf-Delay 20mS, Max-Jbuf-Delay 30mS
Received-RTP:
Packets 238, Loss 0.0% #0, Avg-Loss 0.0%, RTT 24mS #0, Avg-RTT 21mS, Jitter 0mS
#0, Avg-Jitter 0mS, TTL(last/min/max) 0/61/61, Duplicates 0, Seq-Fall 0, DSCP 0,
 L2Pri 6, RTCP 26
Transmitted-RTP:
VLAN 400, DSCP 46, L2Pri 6, RTCP 34
Remote-Statistics:
Loss 0.0% #0, Avg-Loss 0.0%, Jitter 2mS #0, Avg-Jitter 1mS
Echo-Cancellation:
Loss 49dB #0, Len 0mS
RSVP:
Status Reserved, Failures 0
//to display details of session 2:
Gxxx-001(super)# show rtp detailed 2
Session-ID: 2
Status: Active, QOS: Ok, EngineId: 0
Start-Time: 2015-08-23,09:55:20, End-Time: -
Duration: 00:00:50
CName: gwp@33.33.33.33
Phone: 1402
:80886:1003
Local-Address: 33.33.33.33:61175 SSRC 3702564610
Remote-Address: 149.49.41.50:61175 SSRC 15161893 (0)
Samples: 10 (5 sec)
Codec:
G711U 40B 0mS Off, Silence-suppression(Tx/Rx) Disabled/Disabled, Play-Time 161.9
00sec, Loss 0.0% #0, Avg-Loss 0.0%, RTT 103mS #0, Avg-RTT 105mS, JBuf-under/over
runs 0.0%/0.0%, Jbuf-Delay 11mS, Max-Jbuf-Delay 13mS
Received-RTP:
Packets 8094, Loss 0.0% #0, Avg-Loss 0.0%, RTT 8mS #0, Avg-RTT 9mS, Jitter 0mS #
0, Avg-Jitter 0mS, TTL(last/min/max) 0/64/64, Duplicates 0, Seq-Fall 0, DSCP 0,
L2Pri 6, RTCP 30
Transmitted-RTP:
VLAN 400, DSCP 46, L2Pri 6, RTCP 30
Remote-Statistics:
Loss 0.0% #0, Avg-Loss 0.0%, Jitter 1mS #0, Avg-Jitter 0mS
Echo-Cancellation:
Loss 49dB #0, Len 0mS
RSVP:
Status Reserved, Failures 0

For clarity, suggest: The conference ID that appears in the Phone string for session 1 and for session 2 is identical and indicates that the two sessions belong to the same conference call [1] [2].