server A and server B have asterisk 1.2.4.
The external IP of server A is 1.2.3.4 .
I try to establish a trunk from server A to server B (peer and register=> entry on server A, user entry on server B).

On server B:

[username]
type=user
host=dynamic
secret=asreadonpastebindotcom
bandwidth=low
context=from-gadot

asterisk 1.2.4 on both ends. The register entry on server A is:

register => username:asreadonpastebindotcom@hostname.of.server.A.com

Both A and B  are behind different NATs of some sort. A has a full IP address reverse-NATed. B has only the IAX port forwarded. I refer to the external address. authentication packets do reach the server.


The output from iax debug for the time of a registration on server A is:

Rx-Frame Retry[ No] -- OSeqno: 000 ISeqno: 000 Type: IAX     Subclass: REGREQ 
   Timestamp: 00003ms  SCall: 00004  DCall: 00000 [1.2.3.4:4569]
   USERNAME        : username
   REFRESH         : 60

Mar 22 10:03:13 NOTICE[16534]: chan_iax2.c:5044 register_verify: No registration for peer 'username' (from 1.2.3.4)
Tx-Frame Retry[000] -- OSeqno: 000 ISeqno: 001 Type: IAX     Subclass: REGREJ 
   Timestamp: 00015ms  SCall: 00003  DCall: 00004 [1.2.3.4:4569]
   CAUSE           : Registration Refused
   CAUSE CODE      : 29


With the following I fail to register. changing to type=friend I manage to register. What am I missing?