Merging bandwidth between 3 different dsl line

my title may be kinda confusing but the thing is i have this one request to merge bandwidth of a company…
they say they have 3 different dsl lines and the requested from me to merger their bandwidth ( let say 1 dsl is 1mb line that means they wanted to merge all 3 dsl lines = 3mb line)

Is it possible to configure the MT router to fulfill this task?

any help guys?

the only true way to do this is with the ISP doing MLPPP on your DSL lines.

With mikrotik you can do load balancing between the 3 dsl lines but for true bonding your ISP has to support MLPPP


for load balancing:
http://wiki.mikrotik.com/wiki/Load_Balancing_over_Multiple_Gateways