bandwidth aggregation

hi click users group,

i have a wan problem that effects my sip voicemail service under busy
loads, you know...jitter and latency.

the best i can get where i am at is 15mg down and 2mg up with business
cable with a static ip for the sip carrier to find me.

i could add a consumer connection at 30mg down and 5mg up, but it would be
dhcp.

i have not figured out yet whether aggregating a static and dhcp connection
together is feasible with sip.

wondering if anyone had any ideas about wan aggregation for a situation
like this?

and if so, i would more than happy to pay for expertise and setting up a
solution that will work.

if you are more comfortable contacting me off-list, you can at
[email protected]

thanks in advance,
dave