Testing, disable TLS and use IPv4-only network for easy comparison (Prosody 0.8.2 is IPv4 only)

# Asterisk 1.8.23.0 - Prosody 0.8.2
# Network IPv4-only
# asterisk -c
# (Segmentation fault)
tcpdump -n -i lo -s0 -w prosody-0.8.2-no_tls.pcap

The key packet is:
====================================
tcpdump -A -vvv 'port 5222' -r prosody-0.8.2-no_tls.pcap
--
15:29:21.776374 IP (tos 0x0, ttl 64, id 53576, offset 0, flags [DF], proto TCP (6), length 1167)
   localhost.priv.abelbeck.com.5222 > localhost.priv.abelbeck.com.36185: Flags [P.], cksum 0x0284 (incorrect -> 0x57aa), seq 1599:2714, ack 1340, win 579, options [nop,nop,TS val 500146 ecr 500141], length 1115
E....H@.@.g..........f.YG.I.G.x....C.......
........<iq id='disco' type='get' to='asterisk@pbx3.priv.abelbeck.com/asterisk'><query xmlns='http://jabber.org/protocol/disco#info'/></iq><presence from='asterisk@pbx3.priv.abelbeck.com/asterisk'><status>Online and Available</status><priority>0</priority><c ver='asterisk-xmpp' ext='voice-v1' node='http://www.asterisk.org/xmpp/client/caps' xmlns='http://jabber.org/protocol/caps'/></presence><presence type='unavailable' to='asterisk@pbx3.priv.abelbeck.com/asterisk' from='admin@pbx3.priv.abelbeck.com'/><presence type='unavailable' to='asterisk@pbx3.priv.abelbeck.com/asterisk' from='lonnie@pbx3.priv.abelbeck.com'/><presence type='unavailable' to='asterisk@pbx3.priv.abelbeck.com/asterisk' from='ipad@pbx3.priv.abelbeck.com'/><iq id='roster' type='result' to='asterisk@pbx3.priv.abelbeck.com/asterisk'><query ver='21' xmlns='jabber:iq:roster'><item jid='admin@pbx3.priv.abelbeck.com' subscription='both'/><item jid='lonnie@pbx3.priv.abelbeck.com' subscription='both'/><item jid='test@pbx2.priv.abelbeck.com' ask='subscribe' subscription='from'/><item jid='ipad@pbx3.priv.abelbeck.com' subscription='both'/></query></iq>
====================================



# Asterisk 1.8.23.0 - Prosody 0.9.0
# Network IPv4-only
# asterisk -c
# (Works !)
tcpdump -n -i lo -s0 -w prosody-0.9.0-no_tls.pcap

The key packet is:
====================================
tcpdump -A -vvv 'port 5222' -r prosody-0.9.0-no_tls.pcap
--
15:35:52.552149 IP (tos 0x0, ttl 64, id 242, offset 0, flags [DF], proto TCP (6), length 1206)
   localhost.priv.abelbeck.com.5222 > localhost.priv.abelbeck.com.42910: Flags [P.], cksum 0x02ab (incorrect -> 0x744b), seq 1583:2737, ack 1340, win 579, options [nop,nop,TS val 4294847108 ecr 4294847102], length 1154
E.....@.@.7N.........f.... f.......C.......
..*...*~<iq id='disco' type='get' to='asterisk@pbx3.priv.abelbeck.com/asterisk' from='asterisk@pbx3.priv.abelbeck.com'><query xmlns='http://jabber.org/protocol/disco#info'/></iq><presence from='asterisk@pbx3.priv.abelbeck.com/asterisk'><status>Online and Available</status><priority>0</priority><c ver='asterisk-xmpp' ext='voice-v1' node='http://www.asterisk.org/xmpp/client/caps' xmlns='http://jabber.org/protocol/caps'/></presence><presence type='unavailable' to='asterisk@pbx3.priv.abelbeck.com/asterisk' from='admin@pbx3.priv.abelbeck.com'/><presence type='unavailable' to='asterisk@pbx3.priv.abelbeck.com/asterisk' from='lonnie@pbx3.priv.abelbeck.com'/><presence type='unavailable' to='asterisk@pbx3.priv.abelbeck.com/asterisk' from='ipad@pbx3.priv.abelbeck.com'/><iq id='roster' type='result' to='asterisk@pbx3.priv.abelbeck.com/asterisk'><query ver='21' xmlns='jabber:iq:roster'><item jid='admin@pbx3.priv.abelbeck.com' subscription='both'/><item jid='lonnie@pbx3.priv.abelbeck.com' subscription='both'/><item jid='test@pbx2.priv.abelbeck.com' ask='subscribe' subscription='from'/><item jid='ipad@pbx3.priv.abelbeck.com' subscription='both'/></query></iq>
====================================

Note the difference in the key packet is 0.9.0 includes
-- iq id='disco' type='get' ... --
from='asterisk@pbx3.priv.abelbeck.com'
--
and 0.8.2 does not include the 'from=...'

Possibly it may be more complicated than this, but this looks like the magic difference.