G700; G350; G430; G450: 'MaintObject_CMG_EventID_35' alarm on G700 media gateway

Doc ID    SOLN133360
Version:    6.0
Status:    Published
Published date:    24 Feb 2016
Created Date:    20 Nov 2008
Author:   
Content Migrator
 

Details

 

Version 1.
 
1. Old installation but recently user starts getting chronic alarms<<MaintObject_CMG_EventID_35>> from one of the G700 media gateway at this location.
 
2. Meaning of "CMG_EventID_35" alarm is:
<<cmgVoipOccFault - One or more of the VoIP engines in the
media gateway is over is its occupancy threshold as measured by a snapshot: (Channels In Use/Total Channels).>>
 
3. Logs on MG have multiple entries :
 
0000171862 10/21-11:12:26.64 XXX-XXXXXXXX-00000 0 0 0
VIP-TRPMINNO-00000 XXX-TRPXXXXX-00000 cmgVoipOccClear TRAP
0000171861 10/21-11:12:26.63 VIP-TRPMINNO-00000 0x64 0 0x5a
VoIP Occupancy now below threshold
0000171860 10/21-11:12:08.53 XXX-XXXXXXXX-00000 0 0 0
VIP-TRPMINNO-00000 XXX-TRPXXXXX-00000 cmgVoipOccFault TRAP
0000171859 10/21-11:12:08.52 VIP-TRPMINNO-00000 0x64 0 0x5a
VoIP Occupancy exceeded threshold
 
3. VoIP resource usage in MG is highly utilized:

MG-003-2(super)# sh voip-parameters
VOIP ENGINE PARAMETERS
---------------------------------------------------------
Slot Number : v0
Current IP Address : 172.24.220.15
Static IP Address : 172.24.220.15
DHCP Used : No
DSP Firmware Version: 72
MAC Address : 00-04-0D-EF-DC-F1
Fault Status : No Fault Messages
Additional Status : No Status Messages
CURRENT STATE
---------------------------------------------------------
In Use : 15 of 64 channels, 900 of 1920 points (46.9% used)
DSPs State : In use
Admin State: Release
 
 
4. Codec set 2 is used for intra-region calls and set 7 is for inter-region calls:

display ip-network-region 2 Page 1 of 19
IP NETWORK REGION
Region: 2
Location: Authoritative Domain:
Name: ANNEX
MEDIA PARAMETERS Intra-region IP-IP Direct Audio: yes
Codec Set: 2 Inter-region IP-IP Direct Audio: yes
UDP Port Min: 2048 IP Audio Hairpinning? y
 

Inter Network Region Connection Management
src dst codec direct WAN-BW-limits Video Dyn
rgn rgn set WAN Units Total Norm Prio Shr Intervening-regions CAC IGAR
2 17 y NoLimit n
2 2 2
2 3 7 y NoLimit n
2 4 4 y NoLimit n
2 5 7 y NoLimit n
2 6 7 y NoLimit n
2 7 7 y NoLimit n
2 8 7 y NoLimit n
 
5. Codec sets indicate that G729 in codec set 7 is mostly used for inter-region calls

list ip-codec-set
IP CODEC SETS
Codec Codec 1 Codec 2 Codec 3 Codec 4 Codec 5
Set
1 G.711MU G.729B G.729AB G.729A G.729
2 G.711MU G.729B G.729 G.729A G.729AB
3 G.711MU G.729B
4 G.711MU G.729A G.729B
5 G.711MU G.729B
6 G.711MU G.729B
7 G.729 G.729B G.729A

 
 

Problem Clarification

 

User was using initially G.711 for inter-region calls. Then to resolve voice quality problem Avaya advised to switch to codec G729.
Codec G729 uses twice as much of VoIP resources as G.711. MG G700 has only 64 available VoIP channels on motherboard and when codec G729 is used they are reduced by half.

Cause

 

Lack of VoIP resources on MG due to usage of G.729 codec.

Solution

 

  1. Check if additional MM760 that has additional 64 VoIP channels (for G.711) can be added to MG.
  2. Check if some Media Modules (MM) can be swapped. For example if you can swap DCP board MM717AP (24 DCP phones)  in one MG with analog MM711A (only 8 analog phones) in another MG. This might more evenly distribute endpoints among Media Gateways at one site. Rewiring will be needed in this case.
  3. Also try to combine extensions that mostly used to call-in or call-out to a MG that has a PSTN Trunk connected. This can generally reduce usage of VoIP resources for Telco calls.
 
  1. Add MM760.
  2. Swap Media Modules.
  3. Administer extensions for call-in and call-out to MG with Telco Trunk.
 

Legacy ID

KB01055589

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