Also the more reliable carriers will only provide you service if they provide the medium for their SIP traffic. The other providers that don't require that wont have the same amount of reliabilty or QoS. Les.net is often used for SoHo configurations or for comnpanies that have less than 5 users.
Configure Multicast Paging on the Cisco IP Phone 7800 Series or 8800 Series Multiplatform Phone
The Cisco IP Phone 7800 and 8800 Series Multiplatform Phones provide voice communication over an Internet Protocol (IP) network...
Add Call Park on a Cisco 7800 or 8800 Series Multiplatform Phone Key Expansion Module
Call park allows the user of the phone to put an incoming call on hold so that the call can be retrieved on another phone. A call is park...