hello. we are trying to share the IP 403 for two related companies in one office so we can make internal calls. The CCU is serviced with 3 ISDN2 and 3 POTS lines. one company has 2 ISDN2 and 1 POTS. we want to force the line used by each extension during outgoing calls so each company is not paying for the others outgoing calls and also so we dont get any caller ID issues with returned calls. if this is too basic pls point me at the right thread as i failed to search it out. i guess its a SC and Dial function - right ? p.s. we dont want to dial 9 etc to select the line !