No, Tropo uses Prism, Voxeo's enterprise grade SIP application server: http://www.voxeo.com/prism/. Tropo's application layer is also open source and will run on any SIP servelet server.
Thank you for asking. "Enterprise grade" can be a vague marketing term. This is what Voxeo means when we say PRISM is "enterprise grade":
1. Fault tolerant: Including the ability to do state-full failover of applications from one PRISM server instance to another.
2. Scalable: Proven ability to scale to over 25,000 calls per server.
3. High performance: Proven ability to scale to over 800 call setups (new calls) per second per server.
4. Standards-based: PRISM implements the Java SIP servlet standards (JSR-289) and Java Media Control standard (JSR-309). PRISM applications can run unmodified on similar platforms from Oracle, IBM, and Redhat - and vice versa.
5. Support: PRISM is backed by a company with guaranteed 24x7 support, under 20 minute response times, over 150 employees, world-wide offices, financial stability, and 10 years of experience.
On top of that, yes, PRISM is often used in the enterprise and by service providers. :)
PRISM is also used for everything we do at Voxeo. All of our products and services, including Tropo, are built on top of PRISM.
PRISM is a highly scalable, reliable, and extensible communications application server. It's a very proven platform and is used by several of the largest consumer and commercial VoIP providers. It's also used in Microsoft's Tellme service and is the foundation of all of Voxeo's products and services.
Asterisk can be painful, but they have a new ground-up project in very-early (pre-beta) stage called Asterisk SCF that is designed to achieve PRISM-like capabilities.
