[asterisk-users] Unable to register an endpoint after upgrading from 1.4.2.20 to 1.8.3.1

[Imanol Pardavila]

Hello,
I've just upgrade from 1.4.2.20 to 1.8.3.1 and some kind of endpoint 
aren't able to register. Message is:
[Jul 16 01:26:15] NOTICE[25443]: chan_sip.c:23511 
handle_request_register: Registration from '<sip:user637801>' failed for 
'X.X.X.X:5060' - No matching peer found

sip.conf

[user637801]
type=friend
context=FROMuser637805
host=dynamic
secret=password
dtmfmode=rfc2833
disallow=all
allow=g729
allow=ulaw
allow=alaw
nat=yes
canreinvite=no
call-limit=2

REGISTER sip:Y.Y.Y.Y SIP/2.0.
From: <sip:user637801>;tag=e00028-c0a800fd-13c4-50029-508b5-41d85fb5-508b5.
To: <sip:user637801>.
Call-ID: e162cc-c0a800fd-13c4-50029-508b5-18c6cea7-508b5.
CSeq: 2 REGISTER.
Via: SIP/2.0/UDP 192.168.100.2:42904;branch=z9hG4bK-508b5-13aa048e-5ff4a5b9.
Max-Forwards: 70.
Expires: 60.
Authorization: Digest 
username="user637801",realm="asterisk",nonce="7bf18d37",uri="sip:Y.Y.Y.Y",response="ce8847cf30a69e1c7735de86a82c3e6e",algorithm=MD5.
Contact: <sip:987987987 at 192.168.100.2:42904>.
Content-Length: 0.

SIP/2.0 100 Trying.
Via: SIP/2.0/UDP 
192.168.100.2:42904;branch=z9hG4bK-508b5-13aa048e-5ff4a5b9;received=X.X.X.X.
From: <sip:user637801>;tag=e00028-c0a800fd-13c4-50029-508b5-41d85fb5-508b5.
To: <sip:user637801>.
Call-ID: e162cc-c0a800fd-13c4-50029-508b5-18c6cea7-508b5.
CSeq: 2 REGISTER.
Server: ASTERISK.
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, 
INFO, PUBLISH.
Supported: replaces, timer.
Content-Length: 0.

SIP/2.0 403 Forbidden (Bad auth).
Via: SIP/2.0/UDP 
192.168.100.2:42904;branch=z9hG4bK-508b5-13aa048e-5ff4a5b9;received=X.X.X.X.
From: <sip:user637801>;tag=e00028-c0a800fd-13c4-50029-508b5-41d85fb5-508b5.
To: <sip:user637801>;tag=as710c9007.
Call-ID: e162cc-c0a800fd-13c4-50029-508b5-18c6cea7-508b5.
CSeq: 2 REGISTER.
Server: ASTERISK.
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, 
INFO, PUBLISH.
Supported: replaces, timer.
Content-Length: 0.

I think the problem is that REGISTER packet has:
sip:user637801, instead of sip:user637801 at Y.Y.Y.Y

This works in 1.4 version but not in 1.8; it maybe more restrict?
I can't add @Y.Y.Y.Y in end point's configuration; is there any option 
to put in peer configuration to allow this registration?
Thanks
Imanol