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Cisco Bug: CSCvv22146 - " LostPacketRate" showing 0 in show commands when there is a packet loss in the network

Last Modified

Oct 05, 2020

Products (1)

  • Cisco 4000 Series Integrated Services Routers

Known Affected Releases

16.12.3

Description (partial)

Symptom:
" Show call active voice brief " is not showing the right amount of  " LostPacketRate " when there is a packet loss in the network.

Example :

0    : 95288 2766553410ms.1 (05:05:41.660 UTC Tue Jan 26 2021) +5400 pid:6668 Answer 3001 connected
 dur 00:01:32 tx:4580/916000 rx:4445/889000 dscp:0 media:0 audio tos:0xB8 video tos:0x0
 IP 10.201.221.203:24600 SRTP: off rtt:0ms pl:0/0ms lost:82/0/0 delay:1/0/0ms g711ulaw TextRelay: off Transcoded: No ICE: Off
 media inactive detected:n media contrl rcvd:n/a timestamp:n/a
 long duration call detected:n long duration call duration:n/a timestamp:n/a
 LostPacketRate:0.00 OutOfOrderRate:0.00
 LocalUUID:7bec5adb31acc174184333179f9b2ba0
 RemoteUUID:fa63ffa3bedba25f53723bba26172482
 VRF: NA
0    : 95289 2766553410ms.2 (05:05:41.660 UTC Tue Jan 26 2021) +5400 pid:6668 Originate 2001 connected
 dur 00:01:32 tx:4445/889000 rx:4580/916000 dscp:0 media:0 audio tos:0xB8 video tos:0x0
 IP 10.201.221.201:24606 SRTP: off rtt:0ms pl:0/0ms lost:0/0/0 delay:2/0/0ms g711ulaw TextRelay: off Transcoded: No ICE: Off
 media inactive detected:n media contrl rcvd:n/a timestamp:n/a
 long duration call detected:n long duration call duration:n/a timestamp:n/a
 LostPacketRate:0.00 OutOfOrderRate:0.00
 LocalUUID:fa63ffa3bedba25f53723bba26172482
 RemoteUUID:7bec5adb31acc174184333179f9b2ba0
 VRF: NA
Telephony call-legs: 0
SIP call-legs: 2
H323 call-legs: 0
Call agent controlled call-legs: 0
SCCP call-legs: 0
STCAPP call-legs: 0
Multicast call-legs: 0
Total call-legs: 2

Conditions:
When trying to configure for Audio quality monitoring 

Call flow : Jabber --- CUCM---sip-- CUBE--- sip---Jabber 

- RTCP is enabled on both end devices. 

- Config for AQM in place. 
callmonitor
rtcp all-pass-through
mode border-element license capacity 10
media statistics
media bulk-stats

call-quality
max-dropout 2
max-reorder 2

After this configuration , there is still no "Lostpacketrate" seen. All the values are "0"
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