Overview

Our SIP works with top IP-PBX manufacturers

Session Initiation Protocol (SIP) is the common signaling standard for real-time communications including Voice over Internet Protocol (VoIP). SIP is an open-standard which allows carrier voice equipment to interoperate seamlessly with customer premise equipment (CPE). The logical voice channel established between them is referred to as a SIP Trunk; a virtual phone line that utilizes a Broadband connection for access.

Convergence works directly with an IP PBX as well as with legacy customer premise equipment (CPE) which uses an Integrated Access Device (IAD), commonly referred to as a gateway.

Convergence SIP Trunking delivers inexpensive local, toll-free, domestic and international long distance service through the Convergence national footprint covering North America with per trunk and per minute rates much lower than that of traditional service. Also, with phone numbers from over 5,000 rate centers, Convergence can provide new or port existing numbers nationwide.

Features and Benefits of SIP Trunking

Built for Savings - The features of Convergence Phone Service

Voice Quality

Voice Quality and End to End Redundancy

Customer Premise

Convergence ensures that the customer's LAN and WAN are optimized by ensuring that the voice traffic (which is “real-time” traffic) has the highest priority from the phone to the switch. This is done with 802.1q VLAN tagging. When traffic is passed from the switch to the router, the traffic carries the same VLAN on the LAN side of the router. The router is set up with QoS and will tell the router that UDP traffic (voice traffic) has a higher priority as it leaves the internet connection. We prefer a non shared WAN service such as DSL, T-1 or MPLS as these circuits have a direct connection to the closest central office. The central office has a high capacity fiber optic connection to the core internet backbone. The core internet backbone routers will sense that UDP traffic is passing and automatically give it a higher priority.  However, this is rarely used as backbone interconnections are always multiple OC192 10Gbit/s or OC768 40Gbit/s and are always upgraded as usage hits 80% of capacity.

Convergence Data Center
The Convergence Systems Data Center has 8 OC48's blended 20Gbit/s, and load balanced from multiple carriers using diverse entry into the building to multiple AT&T CO’s. The Data Center has a route science load balancer that will intelligently find the quickest and best quality route, even if it’s a longer route with more hops. The Data Center has a 24/7 NOC, redundant CRAC cooling systems, humidity control, 24 hour battery backup with a generator that stores two weeks of diesel fuel.

System Architecture
When voice traffic comes in, it is routed by two redundant 6509 Cisco routers. The System is made up of a cluster of redundant Sun Servers that run Mitel call control software configured as user and trunking gateway systems. Dial tone is provided by multiple PRI's coming from multiple fiber connections, backed-up by SIP trunking that can be routed over one of the 8 OC48 connections. All telephony applications run on a high available VMware environment tied into a SAN.