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Calls disconnect after received by user

I'm having an issue with my PBX.  We are currently running CME 7.1.5.

We receive calls from an 888 number that hits a hunt group.  Incoming calls will disconnect after any time up to about a minute.  Also, we are receiving a crackling sound on calls randomly.

I've experienced the crackling on phone with than the hunt group phones so I'm not totally sure if it's isolated to just those phone.  I've also tried swapping out for new phones and rebooting the CME.

Any ideas?
Voice Over IP

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VSUTech

8/22/2022 - Mon
VSUTech

ASKER
Update:

The disconnects are occurring when calls go to voicemail as well.
José Méndez

What type of connection you have toward the PSTN?
VSUTech

ASKER
It's an ISDN connection
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rwheeler23
sr75

Sounds like it may be VAD.  Make sure that all of your voip dial-peers have the "no vad" command in them.
VSUTech

ASKER
Would VAD all of a sudden become an issue?

Nothing has changed for months in our configuration.
sr75

A similar problem happened to me in the past after it working great for several months.
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VSUTech

ASKER
It looks like they do have "no vad" on each


dial-peer voice 100 pots
 description Outbound Calling (Long Distance)
 destination-pattern 81[2-9]..[2-9]......
 direct-inward-dial
 port 0/0/0:23
 forward-digits 11
!
dial-peer voice 101 pots
 description Outbound Calling (Local)
 destination-pattern 8[2-9]......
 direct-inward-dial
 port 0/0/0:23
 forward-digits 7
!
dial-peer voice 102 pots
 description Outbound Calling (911)
 destination-pattern 911
 direct-inward-dial
 --More--                            port 0/0/0:23
 forward-digits 3
!
dial-peer voice 200 voip
 description Inbound Calling
 destination-pattern 2..
 session target ipv4:10.2.0.1
 codec g711ulaw
 no vad
!
dial-peer voice 6000 voip
 mailbox-selection orig-called-num
 description CUE Voicemail
 destination-pattern 6000
 session protocol sipv2
 session target ipv4:10.2.0.2
 dtmf-relay sip-notify
 codec g711ulaw
 no vad
!
dial-peer voice 6001 voip
 description CUE Administration
 destination-pattern 6001
 --More--                            session protocol sipv2
 session target ipv4:10.2.0.2
 dtmf-relay sip-notify
 codec g711ulaw
 no vad
!
dial-peer voice 300 voip
 description *** Auto Attendant
 destination-pattern 300
 session protocol sipv2
 session target ipv4:10.2.0.2
 dtmf-relay sip-notify
 codec g711ulaw
 no vad
!
dial-peer voice 301 voip
 description D*** g Auto Attendant
 destination-pattern 301
 session protocol sipv2
 session target ipv4:10.2.0.2
 dtmf-relay sip-notify
 codec g711ulaw
 no vad
 --More--                           !
dial-peer voice 306 voip
 description *** Investors Auto Attendant
 destination-pattern 306
 session protocol sipv2
 session target ipv4:10.2.0.2
 dtmf-relay sip-notify
 codec g711ulaw
 no vad
!
dial-peer voice 310 voip
 description ***
 answer-address 310
 destination-pattern 310
 session protocol sipv2
 session target ipv4:10.2.0.2
 dtmf-relay sip-notify
 codec g711ulaw
 no vad
!
dial-peer voice 311 voip
 description *** Welcome AA
 destination-pattern 311
 --More--                            session protocol sipv2
 session target ipv4:10.2.0.2
 dtmf-relay sip-notify
 codec g711ulaw
 no vad
!
dial-peer voice 3111 voip
 description *** Voicemail AA
 destination-pattern 3112
 session protocol sipv2
 session target ipv4:10.2.0.2
 dtmf-relay sip-notify
 codec g711ulaw
 no vad
!
dial-peer voice 103 pots
 description Outbound Call (International)
 destination-pattern 8011T
 port 0/0/0:23
!
dial-peer voice 313 voip
 description Copy Machine Fax Machine
 destination-pattern 313
 --More--                            session protocol sipv2
 session target ipv4:10.2.0.3
 codec g711ulaw
 no vad
!
dial-peer voice 2 pots
 incoming called-number .
 direct-inward-dial
 port 0/0/0:23
!
ASKER CERTIFIED SOLUTION
José Méndez

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VSUTech

ASKER
Thanks for the suggestion...

I'm trying to replicate the issue right now but after 25 calls or so I can't get it to disconnect.

Could this have been an issue with the service provider?  They have been "monitoring" the line for the past 4 hours or so.  I'm still waiting to hear back from them.
SOLUTION
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VSUTech

ASKER
it appears this was a service provider issue.  I wasn't able to replicate the issue with the additional logging.
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