conf/tones.conf from wiki page why nobody bothered to submit a jira so they would be included instead putting them on the wiki to be overlooked

save via_string when sent to nh so we can use it in session timer re-invites to fix double nat issue

	     If max tries is reach and user has not made a valid entry then system transfers the call leg to the specified destination.

This prevented 'make mod_callcenter' from working because the 'all' in
'callcenter' was matching.

FS-3510 --resolve make all instances of execute_on_X uniform with api_on_X and support both prefix vars as before and usage of arrays to push several exexute_on or api_on records into one variable