I have a site to site tunnel,I have IP phones on both site A and site B trying to connect to a call manager. Site A router has 2 wan link, link 1 for site2site tunnel to site B and the link 2 to connect to call manager. Site A phones will nat out to a public IP on link 2 and reach the call manager, I would like the IP phones on site B to tunnel(site2site) in link 1 on site A then nat out to a public ip on link 2 to reach the call manager. Now Site to site works fine, I believe the nat part has to have a statement for site B lanrange to nat out site A link 2.
For the site to site tunnel , access list has been created to allow site B lanrange to Call manager ip, eg. access-list site2siterule permit ip 192.168.88.0 0.0.0.255 host 'call manager ip'.