| The following article explains what SIP and VOIP are | | | | AT&T - offers quality service which is also reliable |
| and lists a few of the more prominent names of SIP | | | | and secure. |
| VOIP providers in the USA. | | | | APEX Telecom - it based in California and |
| SIP stands for Session Initiation Protocol and VOIP | | | | provides additional services apart from traditional voice |
| stands for Voice over Internet Protocol. SIP is the | | | | and data services. |
| Internet Engineering Task Force procedure for VOIP | | | | Nextiva - choice of unlimited or metered calls, |
| and other text and multimedia gatherings such as | | | | flexible packages of which auto attendant facility is |
| video, online games and instant messaging, to name a | | | | one. |
| few. There are several SIP VOIP providers who offer | | | | RingCentral -unlimited calling to US and Canada, |
| their services to businesses, call centers and other | | | | free customer support 24/7 and advanced answering |
| organizations. | | | | rules and call forwarding are some of the features. |
| SIP is basically an application related control protocol | | | | TerraSip -membership is absolutely free but calls |
| for initiating, amending and concluding sessions like | | | | to landlines and mobile phones come with a charge. |
| Internet telephone calls, multimedia conferences and | | | | ViaTalk -comes with 40 unique calling features |
| distribution with participants. These protocols include | | | | which include referral programs. |
| certain depictions that let participants adhere to a set | | | | 8x8 virtual Office - comes with all digital IP phones |
| of matching media types. Aspects like proxy servers | | | | loaded with the best features. |
| are used to enable requests to be routed to the user's | | | | Almost all SIP VOIP providers charge anywhere |
| existing location, confirm and approve users for such | | | | between $8 and $30 as VOIP fees. The less |
| services and execute call routing policies. SIP VOIP | | | | expensive the charges, the lesser will be the number |
| providers also make available a registration function | | | | of features usually associated with it. For example, a |
| that acknowledges users to upload their present | | | | provider whose charges are very cheap may not |
| positions to be used by proxy servers. Similar to the | | | | probably offer the facility of making calls outside of |
| web protocol, HTTP, messages include headers and a | | | | their network. |
| body. | | | | Determine what features you want and browse the |
| Some SIP VOIP providers in the US are as follows: | | | | websites of service providers to try and understand |
| - offers reasonable services that can be used with | | | | the kind of features and costs that are on offer |
| PAP2. | | | | before finalizing on SIP VOIP providers. |
| Callcentric - between callcentric members, it offers | | | | To find out about SIP VOIP providers in your area you |
| unlimited free calling. | | | | can look up the Internet and get a number of providers |
| Voxalot - offers free calling service and | | | | who will offer various schemes which you can |
| configuration of outgoing paid providers. | | | | compare before selecting one. |