for msrp relay auth use domain from sip address, use --msrp-relay param only as host address

darcs-hash:20081114070100-b2873-c67a1a28c22ff10a8d24ebe36172a27d44ca2e0a
exit readloop if invite failed

darcs-hash:20081114084947-b2873-c925573d5953fce95386f9eac4084793af74dc2e