Basic Intro:
I have limited personal experience with the Telemarketing industry,
and I now find myself (...I think) in need of telemarketing services
from an established telemarketing firm.

Some More Details:
I have custom-developed a series of "website management products"
specifically for the legal industry.   At this point, I am trying to
sell these website related services to law firms that wish to
refine/optimize/etc. their existing websites.

The product developed is to be sold to clients on a licensing basis;
firms pay a monthly fee for the services rendered on their behalf.

***Here's where matters get a little tricky***
As stated in the previous paragraph, all sales revenue will come in
monthly installments. The subscriptions / client relationships, due to
the nature of the product offered, are expected to last for multiple
years.  (meaning, a secure stream of recurring capital)

The company which developed the monthly services product has limited
capital available for a traditional telemarketing campaign.  (i.e.
cannot afford to pay $1000s upfront, or pay a set fee upfront per
sale)

Rather than paying up front, the software firm is proposes to share a
portion of the monthly recurring revenue from each client with the
telemarketing company which provides the initial sales.  In other
words, for each and every sale, the telemarketing firm will receive an
agreed upon monthly fee, for the life of the client's contract. 
(Perhaps $5 per month per client.)

To facilitate the sales process, I have manually collected a "Digital
Rolodex" of law firms with live websites which could greatly benefit
from the services the telemarketing firm would sell.  To date, I have
several hundred telephone numbers - but lack the resources to complete
the sales.

-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

* Given the above information (limited capital presently available /
alternative is unique revenue sharing payment method), can you suggest
a firm which can provide quality telemarketing services?

* Or, perhaps there are better venues than telemarketing with which to
pursue sales to the aforementioned collection of law firms with
existing websites... Any suggestions?