Similarly, Tropo has long had support for inbound and outbound SIP. http://blog.tropo.com/2010/03/09/does-your-cloud-provider-offer-sip-for-full-interop/ http:

Similarly, Tropo has long had support for inbound and outbound SIP. http://blog.tropo.com/2010/03/09/does-your-cloud-provider-offer-sip-for-full-interop/ http://blog.tropo.com/2010/03/09/does-your-cloud-provider-of... (Disclaimer: I work for Voxeo Labs)