Here's a neutral and interesting summary of the text in one paragraph: Chad Stachowicz, CEO of Cloverhound, shares his experience with Twilio's Elastic SIP Trunking service, which allows businesses to connect their Cisco gateways to make and receive calls quickly and affordably. Chad uses this service to help clients get up and running with phone connectivity fast, often doing it overnight for cheap. The process involves provisioning the SIP domain and credentials, creating an IP Access Control List, and configuring the number to point to the SIP Trunk. To connect a Cisco ISR router to Twilio's SIP Trunking, Chad recommends using the B2BUA built into the IOS and following specific configuration steps, including setting up security features like the IOS Trust List to prevent toll fraud. With Twilio's service, businesses can enjoy spectacular audio quality, even when using a B2B tunnel, and pay significantly less than other providers, with rates starting at $1/month per number.