http://www.berklix.com/~jhs/src/bsd/fixes/FreeBSD/src/gen/etc/services.jabber.REL=8.4-RELEASE.diff
By { 12.0-ALPHA8 & 12.1-RELEASE & 2018-11-06 13.0-CURRENT } 
etc/services had moved to usr.sbin/services_mkdb/services

see also:
../../usr.sbin/services_mkdb/services.jabber.REL=CURRENT.diff

Fails on 4.11

*** 7.1-RELEASE/src/etc/services	Tue Nov 25 03:59:29 2008
--- new/src/etc/services	Sat Feb 28 23:17:44 2009
***************
*** 2269,2278 ****
--- 2290,2303 ----
  aol-3		5193/udp   #AmericaOnline3
  xmpp-client	5222/tcp   #XMPP Client Connection
  xmpp-client	5222/udp   #XMPP Client Connection
+ # jabber-client 5222/tcp   #Jabber Client Connection
+ # jabber-client 5222/udp   #Jabber Client Connection
  padl2sim	5236/tcp
  padl2sim	5236/udp
  xmpp-server	5269/tcp   #XMPP Server Connection
  xmpp-server	5269/udp   #XMPP Server Connection
+ # jabber-server	5269/tcp   #Jabber Server Connection
+ # jabber-server	5269/udp   #Jabber Server Connection
  hacl-hb		5300/tcp   # HA cluster heartbeat
  hacl-hb		5300/udp   # HA cluster heartbeat
  hacl-gs		5301/tcp   # HA cluster general services