[Serusers] How to do a large number of relay attempts?

Imagine I have 50 salespeople, and I know the URIs of all of their phones. When an INVITE comes in to SER, I want to keep trying to forward it to the salespeople, one at a time (in series, not in parallel), forever or until one of them accepts the call. (I randomize the order.) QUESTION 1: At first, I tried rewriting the Request URI in a failure route each time t_relay() returned failure, and then calling t_relay() again. But t_relay() doesn't work that way -- when used in a failure route, it requires you to append a branch, and apparently ignores any changes in the Request URI after the failure happens. OK, so in my failure route, I'll append a branch instead of rewriting the Request URI. But the default value of MAX_BRANCHES in config.h is only 12. I think this means I can never try to relay to more than 13 salespeople -- the first t_relay() call, plus 12 t_relay() calls in failure routes. Is this correct? QUESTION 2: OK, so I'll make the value of MAX_BRANCHES greater than 12. But I see in modules/tm/tm.c that MAX_BRANCHES cannot be given a value greater than 31, since each branch occupies one bit in a 32-bit bitmap. So how can I do 50 stateful relays? Or, for that matter, an indefinite number? Thank you for any help! Tim