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agc_2-X/docs/OUTBOUND_OPTIMIZATIONS.txt
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mattf f4e3cd1f05 Added listloader file upload error output 
Added beta outbound call routing code and docs

git-svn-id: svn://192.168.202.10@2620 3d104415-ff17-0410-8863-d5cf3c621b8a
2016-11-15 19:46:42 +00:00

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OUTBOUND DIALING OPTIMIZATIONS DOC Started: 2016-11-15 Updated: 2016-11-15
This document is a work in progress and is meant for reference only, to go over approaches to optimizing and speeding up the outbound auto-dialing processes
Places to look at for speeding up outbound auto-dialing call routing speed:
1. Checking for Local/ channel resolution
2. Database load and query speed
3. AGI script compilation and execution time
SECTION 1. LOCAL/ CHANNEL RESOLUTION
First, and explanation of what exatly the "Local/ channel resolution" issue is. Auto-dial calls are placed from VICIdial to Asterisk using a Local/ channel, which goes to the dialplan and places the calls out through a carrier. When the call is placed, there is no audio stream yet, only signalling, and it stays that way until after the Answer signal is received from the carrier. At that point, the Local/ channel will resolve to it's proper channel pointer(usually SIP/... if using a sip carrier). Where the issues come in, is how long it takes for the audio to begin being received so that the channel pointer can resolve. This is extremely variable, and depends on the end customer carrier, as well as all of the carrier equipment in-between. We ahve seen Local/ channels resolve anywhere from 0.1 seconds up to 2 seconds, and in a small percentage of cases, the channel never resolves because no audio stream is received.
Currently, the outbound call agent routing process will immediately attempt to route the call if the Local/ channel has been resolved, and if it isn't, it will wait 1 second before trying again, then if it is still not resolved, giving up and logging the call as LRERR status. The optimization we are trying in the BETA script is to try multiple attempts at much faster intervals to check for Local/ channel resolution. The compilation of the AGI script can take anywhere from 0.1 to 0.3 seconds, depending on the server hardware and system load, then if the AGI script detects a Local/ channel, it quits and is tried again immediately. This also allows for a longer amount of time to wait for the channel to resolve because the number of loops is adjustable.
SECTION 2. DATABASE LOAD AND QUERY SPEED
Basic my.cnf and proper hardware optimizations. Nothing further yet.
SECTION 3. AGI SCRIPT COMPILATION AND EXECUTION TIME
This section goes over the option of stripping down the AGI routing process(agi-VDAD_ALL_outbound.agi) as much as possible to improve the speed of routing outbound auto-dialed calls.
The following features could safely be removed and still allow for basic outbound call routing functions within the AGI:
"LO" agent search method(try to route to agent on dialed server first, not used in default configs)
CPD AMD, Sangoma call progress, answering machine detection
QueueMetrics logging
concurrent transfers if set to AUTO
extension append CIDname
grade random next-agent-call routing
reminder message, play only
remote-agent call routing
routing initiated recordings
survey recording
survey, play message and wait for dtmf response
text-to-speech survey
inactive trigger process
Removing these features will result in the removal of over 65% of the code in the AGI script. This should greatly improve both perl interpretation time and reduce RAM usage, but might not have a very significant effect on execution time due to all of these removed code segments being enclosed inside of "if" statements that aren't run unless those features are activated anyway.
Testing this change will require either NOT removing the "remote-agent call routing", or testing on a production system that does not use remote-agents.
Possible outbound AGI optimizations(sections to consider removing):
688 747 survey recording
750 988 text-to-speech
1026 1097 QueueMetrics logging
1101 1176 reminder message, play only
1182 2052 survey, play message and wait for dtmf response
2081 2126 CPD AMD, Sangoma call progress
2155 2176 concurrent transfers if set to AUTO
2298 2352 grade random next-agent-call routing
2419 2580 remote agent call routing
2583 2691 routing initiated recordings
2691 2712 extension append CIDname
2725 2811 more QueueMetrics logging
2149 2850 *LO agent search method
2856 2877 concurrent transfers if set to AUTO
2999 3053 grade random next-agent-call routing
3133 3294 remote agent call routing
3297 3405 routing initiated recordings
3407 3427 extension append CIDname
3442 3528 more QueueMetrics logging
3689 3705 more QueueMetrics logging
3721 3737 more QueueMetrics logging
3847 3908 DTMF detection for survey feature
3993 4146 CPD AMD, Sangoma call progress
4192 4211 text-to-speech
4214 4233 commented-out trigger process
NOTES:
The new script we will be testing changes on will be named "agi-VDAD_ALL_outboundBETA.agi".
To be added to dialplan
; BETA VICIDIAL_auto_dialer transfer script Load Balanced:
exten => 8377,1,Playback(sip-silence)
exten => 8377,n,AGI(agi://127.0.0.1:4577/call_log)
exten => 8377,n,Set(LRct=1)
exten => 8377,n,While($[${LRct} < 100])
exten => 8377,n,AGI(agi-VDAD_ALL_outboundBETA.agi,NORMAL-----LB)
exten => 8377,n,Set(LRct=$[${LRct} + 1])
exten => 8377,n,EndWhile()
exten => 8377,n,AGI(agi-VDAD_ALL_outboundBETA.agi,NORMAL-----LB)
exten => 8377,n,Hangup()
Added vicidial_vdad_log table to store debug and timestamp data(examples below). To enabled this level of logging in the BETA script, you must run the following SQL statement:
update system_settings set vdad_debug_logging='1';
| V1150814130000849778 | 192.168.198.5 | 2016-11-15 08:14:17 | 1479215657.011447 | 2016-11-15 08:14:15 | 0.004011 | agi-VDAD_ALL_outbound.agi | 849778 | end-drop-1.25 |
| V1150814130000849778 | 192.168.198.5 | 2016-11-15 08:14:15 | 1479215656.778370 | 2016-11-15 08:14:15 | 0.233063 | agi-VDAD_ALL_outbound.agi | 849778 | waiting-for-agent-1.25 |
| V1150814130000849778 | 192.168.198.5 | 2016-11-15 08:14:15 | 1479215656.545376 | 2016-11-15 08:14:15 | 0.232980 | agi-VDAD_ALL_outbound.agi | 849778 | waiting-for-agent-1 |
| V1150814130000849778 | 192.168.198.5 | 2016-11-15 08:14:15 | 1479215656.312302 | 2016-11-15 08:14:15 | 0.233063 | agi-VDAD_ALL_outbound.agi | 849778 | waiting-for-agent-0.75 |
| V1150814130000849778 | 192.168.198.5 | 2016-11-15 08:14:15 | 1479215656.079066 | 2016-11-15 08:14:15 | 0.233225 | agi-VDAD_ALL_outbound.agi | 849778 | waiting-for-agent-0.5 |
| V1150814130000849778 | 192.168.198.5 | 2016-11-15 08:14:15 | 1479215655.844731 | 2016-11-15 08:14:14 | 0.234320 | agi-VDAD_ALL_outbound.agi | 849778 | waiting-for-agent-0.25 |
| V1150814130000849778 | 192.168.198.5 | 2016-11-15 08:14:15 | 1479215655.841086 | 2016-11-15 08:14:14 | 0.003636 | agi-VDAD_ALL_outbound.agi | 849778 | prerouteQM |
| V1150814130000849778 | 192.168.198.5 | 2016-11-15 08:14:15 | 1479215655.820757 | 2016-11-15 08:14:14 | 0.020319 | agi-VDAD_ALL_outbound.agi | 849778 | preroute |
| V1150814130000849778 | 192.168.198.5 | 2016-11-15 08:14:15 | 1479215655.623380 | 2016-11-15 08:14:14 | 0.014294 | agi-VDAD_ALL_outbound.agi | 849778 | LocalEXIT-5 11 |
| V1150814130000849778 | 192.168.198.5 | 2016-11-15 08:14:15 | 1479215655.426731 | 2016-11-15 08:14:14 | 0.016263 | agi-VDAD_ALL_outbound.agi | 849778 | LocalEXIT-5 10 |
| V1150814130000849778 | 192.168.198.5 | 2016-11-15 08:14:15 | 1479215655.232397 | 2016-11-15 08:14:14 | 0.014853 | agi-VDAD_ALL_outbound.agi | 849778 | LocalEXIT-5 9 |
| V1150814130000849778 | 192.168.198.5 | 2016-11-15 08:14:15 | 1479215655.037638 | 2016-11-15 08:14:13 | 0.014383 | agi-VDAD_ALL_outbound.agi | 849778 | LocalEXIT-5 8 |
| V1150814130000849778 | 192.168.198.5 | 2016-11-15 08:14:14 | 1479215654.843460 | 2016-11-15 08:14:13 | 0.014945 | agi-VDAD_ALL_outbound.agi | 849778 | LocalEXIT-5 7 |
| V1150814130000849778 | 192.168.198.5 | 2016-11-15 08:14:14 | 1479215654.651362 | 2016-11-15 08:14:13 | 0.014983 | agi-VDAD_ALL_outbound.agi | 849778 | LocalEXIT-5 6 |
| V1150814130000849778 | 192.168.198.5 | 2016-11-15 08:14:14 | 1479215654.457621 | 2016-11-15 08:14:13 | 0.014685 | agi-VDAD_ALL_outbound.agi | 849778 | LocalEXIT-5 5 |
| V1150814130000849778 | 192.168.198.5 | 2016-11-15 08:14:14 | 1479215654.262349 | 2016-11-15 08:14:13 | 0.014732 | agi-VDAD_ALL_outbound.agi | 849778 | LocalEXIT-5 4 |
| V1150814130000849778 | 192.168.198.5 | 2016-11-15 08:14:14 | 1479215654.066875 | 2016-11-15 08:14:12 | 0.014224 | agi-VDAD_ALL_outbound.agi | 849778 | LocalEXIT-5 3 |
| V1150814130000849778 | 192.168.198.5 | 2016-11-15 08:14:13 | 1479215653.873137 | 2016-11-15 08:14:12 | 0.014942 | agi-VDAD_ALL_outbound.agi | 849778 | LocalEXIT-5 2 |
| V1150814130000849778 | 192.168.198.5 | 2016-11-15 08:14:13 | 1479215653.677652 | 2016-11-15 08:14:12 | 0.015336 | agi-VDAD_ALL_outbound.agi | 849778 | LocalEXIT-5 1 |
| V1150818290000833387 | 192.168.198.5 | 2016-11-15 08:18:35 | 1479215915.585579 | 2016-11-15 08:18:34 | 0.233213 | agi-VDAD_ALL_outbound.agi | 833387 | waiting-for-agent-0.5 |
| V1150818290000833387 | 192.168.198.5 | 2016-11-15 08:18:35 | 1479215915.351982 | 2016-11-15 08:18:34 | 0.233585 | agi-VDAD_ALL_outbound.agi | 833387 | waiting-for-agent-0.25 |
| V1150818290000833387 | 192.168.198.5 | 2016-11-15 08:18:35 | 1479215915.348672 | 2016-11-15 08:18:34 | 0.003301 | agi-VDAD_ALL_outbound.agi | 833387 | prerouteQM |
| V1150818290000833387 | 192.168.198.5 | 2016-11-15 08:18:35 | 1479215915.329398 | 2016-11-15 08:18:34 | 0.019263 | agi-VDAD_ALL_outbound.agi | 833387 | preroute |
| V1150818290000833387 | 192.168.198.5 | 2016-11-15 08:18:35 | 1479215915.133643 | 2016-11-15 08:18:33 | 0.014761 | agi-VDAD_ALL_outbound.agi | 833387 | LocalEXIT-5 1 |
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