I'm actually having the same issue.
To add a little clarity, if I am using a sip client on my internal network then it registers just fine.
However if I try the same sip client externally I cannot register. I know this used to work before as I always had it on my mobile to patch into the pbx every now and then while on the road.
Now all of a sudden it just doesn't work. I've tried 2 other sip clients on my mobile in the last hour and changed the password multiple times along with testing on both internal and external connections. No dice.
Will let you know if I find anything.
Client: Zoiper (Desktop and Mobile)
Log external attempt:
[2014-05-07 09:43:13] NOTICE[1999] chan_sip.c: Registration from '<sip:
[email protected];transport=UDP>' failed for '172.56.27.26:24945' - Wrong password