Incoming call issue, just rings but nothing to the ATA and system

[acollard83]

Having an issue on one of our Asterisk systems with calling a device, a Cisco SPA112 ATA.

Call comes in, sometimes it rings the device a couple times, stops then rings the device again. Othertimes, it doesn't even ring the device. Both occasions the caller hears ringing. The device connected to the ATA is an Avaya phone system. (trying to get this customer over to a SIP trunk or to a hosted solution, but still need to figure this out.)

SIP datagrams below from VoipMonitor. Also, this only happens on one out of every 50 or 60 calls, but still happens daily. One call the caller said that all they heard was ringing on their end, but no ringing on the Avaya system (datagrams are from this call).

The extensions.conf for this is:

[customer]
exten => 5867XXXXX4,1,Dial(SIP/5867XXXXX4,50)
exten => 5867XXXXX4,2,Goto(5867XXXXX4-${DIALSTATUS},1)
exten => 5867XXXXX4-BUSY,1,Dial(SIP/5867XXXXX6,50)
exten => 5867XXXXX4-BUSY,2,Goto(5867XXXXX6-${DIALSTATUS},1)
exten => 5867XXXXX6-BUSY,1,Dial(SIP/5867XXXXX6,50)
exten => 5867XXXXX6-BUSY,2,Voicemail(5867XXXXX4@default)
exten => 5867XXXXX4-CHANUNAVAIL,1,Dial(SIP/5867XXXXX6,50)
exten => 5867XXXXX4-CHANUNAVAIL,2,Goto(5867XXXXX6-${DIALSTATUS},1)
exten => 5867XXXXX6-CHANUNAVAIL,1,Dial(SIP/5867XXXXX6,50)
exten => 5867XXXXX6-CHANUNAVAIL,2,Voicemail(5867XXXXX4@default)

Relevant sip.conf below:

[5867XXXXX4]
type=friend
secret=(Cleaned Password)
dtmfmode=rfc2833
host=dynamic
nat=no
callerid=Customer Name <5867XXXXX4>
mailbox=5867XXXXX4@default
canreinvite=yes
context=default-586
T38FaxMaxDatagram=38

[5867XXXXX6]
type=friend
secret=(Cleaned Password
dtmfmode=rfc2833
host=dynamic
nat=no
callerid=Customer Name <5867XXXXX4>
mailbox=5867XXXXX4@default
canreinvite=yes
context=default-586
T38FaxMaxDatagram=38