So I'm now using asterisk 1.8.5rc1 for Asterisk. I'm still getting mysterious 
dropped calls. This only happens on calls that are outbound on Dahdi and mostly 
happens in conference calls particularly 8xx-xxx-xxxx

This is the output of the hangup. 

[Ksebpbx1*CLI> 
PRI Span: 1 q931_hangup: other hangup
PRI Span: 1 NEW_HANGUP DEBUG: Calling q931_hangup, ourstate Active, peerstate 
Connect Request, hold-state Idle
PRI Span: 1 q931.c:4845 q931_disconnect: Call 32985 enters state 11 (Disconnect 
Request).  Hold state: Idle
PRI Span: 1 
PRI Span: 1 > DL-DATA request
PRI Span: 1 > Protocol Discriminator: Q.931 (8)  len=9
PRI Span: 1 > TEI=0 Call Ref: len= 2 (reference 217/0xD9) (Sent from originator)
PRI Span: 1 > Message Type: DISCONNECT (69)
PRI Span: 1 TEI=0 Transmitting N(S)=51, window is open V(A)=51 K=7
PRI Span: 1 
PRI Span: 1 > Protocol Discriminator: Q.931 (8)  len=9
PRI Span: 1 > TEI=0 Call Ref: len= 2 (reference 217/0xD9) (Sent from originator)
PRI Span: 1 > Message Type: DISCONNECT (69)
PRI Span: 1 > [08 02 81 90]
PRI Span: 1 > Cause (len= 4) [ Ext: 1  Coding: CCITT (ITU) standard (0)  Spare: 
0  Location: Private network serving the local user (1)
PRI Span: 1 >                  Ext: 1  Cause: Normal Clearing (16), class = 
Normal Event (1) ]
    -- Hungup 'DAHDI/i1/18662006965-1be'

sebpbx1*CLI> 
  == Spawn extension (from-sip, 18662006965, 1) exited non-zero on 
'SIP/7027-00000520'

sebpbx1*CLI> 
PRI Span: 1 
PRI Span: 1 < Protocol Discriminator: Q.931 (8)  len=5
PRI Span: 1 < TEI=0 Call Ref: len= 2 (reference 217/0xD9) (Sent to originator)

sebpbx1*CLI> 
PRI Span: 1 < Message Type: RELEASE (77)
PRI Span: 1 Received message for call 0x20984f0 on 0x7f7f804f24d0 TEI/SAPI 0/0, 
call->pri is 0x7f7f804f24d0 TEI/SAPI 0/0
PRI Span: 1 q931.c:7237 post_handle_q931_message: Call 32985 enters state 0 
(Null).  Hold state: Idle
Span: 1 Processing event: PRI_EVENT_HANGUP
PRI Span: 1 q931_hangup: other hangup
PRI Span: 1 NEW_HANGUP DEBUG: Calling q931_hangup, ourstate Null, peerstate 
Release Request, hold-state Idle
PRI Span: 1 
PRI Span: 1 > DL-DATA request
PRI Span: 1 > Protocol Discriminator: Q.931 (8)  len=9
PRI Span: 1 > TEI=0 Call Ref: len= 2 (reference 217/0xD9) (Sent from originator)
PRI Span: 1 > Message Type: RELEASE COMPLETE (90)
PRI Span: 1 TEI=0 Transmitting N(S)=52, window is open V(A)=52 K=7
PRI Span: 1 
PRI Span: 1 > Protocol Discriminator: Q.931 (8)  len=9
PRI Span: 1 > TEI=0 Call Ref: len= 2 (reference 217/0xD9) (Sent from originator)
PRI Span: 1 > Message Type: RELEASE COMPLETE (90)
PRI Span: 1 > [08 02 81 90]
PRI Span: 1 > Cause (len= 4) [ Ext: 1  Coding: CCITT (ITU) standard (0)  Spare: 
0  Location: Private network serving the local user (1)
PRI Span: 1 >                  Ext: 1  Cause: Normal Clearing (16), class = 
Normal Event (1) ]
PRI Span: 1 q931_hangup: other hangup
PRI Span: 1 NEW_HANGUP DEBUG: Calling q931_hangup, ourstate Null, peerstate 
Null, hold-state Idle
PRI Span: 1 NEW_HANGUP DEBUG: Destroying the call, ourstate Null, peerstate 
Null, hold-state Idle

Any ideas? 
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