IAX connection: Conecion refused, Cause Code 29

Hello.

While trying to make a register on a iax server (FWD) i get this error:

register => 87XXXX:1XXXXXXX@iax.fwdnet.net[/b]

Tx-Frame Retry[000] – OSeqno: 000 ISeqno: 000 Type: IAX Subclass: REGREQ
Timestamp: 00014ms SCall: 00002 DCall: 00000 [192.246.69.186:4569]
USERNAME : 871799
REFRESH : 60

Rx-Frame Retry[ No] – OSeqno: 000 ISeqno: 001 Type: IAX Subclass: REGREJ
Timestamp: 00017ms SCall: 04335 DCall: 00002 [192.246.69.186:4569]
CAUSE : Registration Refused
CAUSE CODE : 29

Tx-Frame Retry[-01] – OSeqno: 001 ISeqno: 001 Type: IAX Subclass: ACK
Timestamp: 00017ms SCall: 00002 DCall: 04335 [192.246.69.186:4569]

I have been working on it for almost a week and still don’t have a clue of what is wrong.

I will really apreciate any help. Gracias!!!