Dropped Call Issue

I had everything working fine, but lately there has been an issue where outgoing calls are dropped as soon as the receiving end answers.

This is the error

[2013-07-16 21:13:26] WARNING[9619][C-00000059]: chan_sip.c:15745 __set_address_from_contact: Invalid contact uri (missing sip: or sips:), attempting to use anyway
[2013-07-16 21:13:26] WARNING[9619][C-00000059]: chan_sip.c:15758 __set_address_from_contact: Invalid URI: parse_uri failed to acquire hostport

Any ideas?