At 00:39 on August 23, 2015, an analog phone with an extension 2111 establishes a call with an IP phone with an extension 2002 in the network described in Four telephones in a sample network.

You must configure the RTP statistics application as described in Four telephones in a sample network. Following complaints related to QoS problems during the call, the administrator performs a check as follows:

//to see if the RTP statistics application registered QoS problems for the call:
Gxxx-001 (super)# show rtp sessions
ID    QoS Start date and time End Time Type        Destination
----- --- ------------------- -------- ---------- ---------------
00001  *1
  2015-08-23,00:39:26 00:41:01  G711U      20.20.20.2
//to display more details on the session:
Gxxx-001 (super)# show rtp-stat detailed 1
Session-ID: 1
Status: Terminated, QOS: Faulted2
, EngineId: 0
Start-Time: 2015-08-23,00:39:26, End-Time: 2015-08-23,00:41:01
Duration: 00:01:35
CName: gwp@30.30.30.1
Phone: 199:2111
Local-Address: 30.30.30.1:2329 SSRC 2764463979 
Remote-Address: 20.20.20.2:2329 SSRC 1260226 (0)
Samples: 19 (5 sec)
Codec:
G711U 200B 20mS Off, Silence-suppression(Tx/Rx) Disabled/Disabled, Play-Time 63.
916sec, Loss 11.0% #153
, Avg-Loss 8.6%, RTT 201mS #0, Avg-RTT 210mS, JBuf-under/o
verruns 9.4%/0.0%, Jbuf-Delay 2mS, Max-Jbuf-Delay 35mS
Received-RTP:
Packets 3225, Loss 0.0% #94
, Avg-Loss 8.4%, RTT 124mS #0, Avg-RTT 96mS, Jitter 11
mS #0, Avg-Jitter 9mS, TTL(last/min/max) 63/63/63, Duplicates 0, Seq-Fall 0, DSC
P 46, L2Pri 12, RTCP 9
Transmitted-RTP:
VLAN 1, DSCP 46, L2Pri 6, RTCP 17
Remote-Statistics:
Loss 11.6% #145
, Avg-Loss 8.9%, Jitter 33mS #0, Avg-Jitter 26mS
Echo-Cancellation:
Loss 49dB #0, Len 32mS
RSVP:
Status Disabled, Failures 0

A few points to note:

• The asterisk in the show rtp sessions output indicates that session 1 has QoS faults [1]

• The QoS is described as Faulted because of QoS faults [2]

• QoS faults that can be seen in the output are:

  • The codec loss event counter indicates that the codec loss exceeded the threshold 15 times [3]

  • The received-RTP packet loss event counter indicates that packet loss exceeded the threshold nine times [4]

  • The remote packet loss event counter indicates that remote packet loss exceeded the threshold 14 times [5]