Added ctrl-x u shortcut for mute in sip_session script

Ignore-this: bbdbb695002ecb6214f2b8dc2fa1943d

darcs-hash:20090914100238-1e3d8-e24a651fd7ed4138669555bb6507b49da97723cc
Fixed xcap_rls_services in case GET gets a non-404 error response

Ignore-this: 5b9a44d1cae48028119ffa91409aa055

darcs-hash:20090914140638-1e3d8-08079786eff06c4ffbf6f740255d8d7f0bbee421