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SIP T1 Service Providers
SIP T1 Definition Continued.
Compression enables SIP T1s to include up to twice as many voice lines without loss of call quality. Virtual DIDs enable companies to appear to have a local presence in other locations of the US, by providing local phone numbers for these locations. Several SIP packages can include international virtual DIDs as well. With an international DID, a company in the US can have a phone number that is local to another location of the world. When that number is called from that location, it rings to the company’s US location like it is a local call. With international virtual DIDs, companies located in the US can appear to a have local presences in many other countries of the world. Another advantage of SIP T1 is that is can be available to any location that it is available over a private bandwidth circuit, or a pubic (internet) circuit. The major advantage SIP over the private circuit of a SIP provider is that the provider can and will ensure priority of voice packets as they travel across their network, until those packets reach the PSTN. This results in perfect voice quality. The major advantage of SIP over the internet is that locations that traditionally could not obtain voice T1 by providers other than their local telephone company, will now have extremely cost effective alternatives, if they are willing to accept that voice quality may not be equal to voice traffic carried over a private network. SIP is available over either T1 or DS3. (Click here to return to top of page)
VoIP and the Importance of QoS
Writen by: Dennis Green
VoIP (voice over internet protocol) services are becoming increasingly available as tier 1 providers are now embracing this technology to improve their voice offerings. Quotes vary depending on the type of VoIP you are seeking. One of the most important elements related to VoIP pricing relates to quality of service (QoS). There are several levels of QoS. To ensure ideal voice quality with VoIP, QoS must be present at every junction throughout the service provider’s network, until the call reaches the public switched telephone network (PSTN). This ensures that voice packets receive priority over other types of data. Where QoS is not present, voice packets have no priority over other forms of data. This often results in latency and jitter. Latency and jitter negatively impact voice quality. Most tier 1 providers can now ensure QoS throughout their systems. This costs money however, thus tier 1 VoIP quotes are often a bit higher priced then VoIP services which utilize the public internet. Internet VoIP can often offer the many valuable features sought by end users, and lower phone costs, such as $45 per month for unlimited long distance service to the continental US and Canada. However, QoS cannot be assured across the public internet. So although an end user can control the QoS throughout their local network, once voice packets reach the internet, QoS can no longer be assured, so voice quality is inconsistent. If call quality with your customers is mission critical to your business, it is advised that whenever possible, obtain a VoIP service which is provided by the same provider that is providing the bandwidth. Then as an extra precaution, it would be wise to require the provider to confirm that they provide and control QoS throughout their system, until each call is transferred to the PSTN. To check availability and pricing for your business locations, complete the pricing tool at the top of this page, or on our home page. It’s real-time, simple, free, and there is no obligation. (Click here to return to top of page)