5. Reliability and disaster recovery. Because they're IP-based, SIP trunks are far more flexible than traditional "fixed" circuits such as T1 or PRI lines. Users can program SIP lines such that if a given user is out of the office, or an entire office is out of commission, the lines roll over to backup sites, phones or devices located anywhere on the company's network — or at a backup facility. It's all based on the business rules you set up ahead of time.
These are just a few of the reasons SIP trunking is taking off, as the Infonetics numbers indicate. Enterprises have been enjoying the benefits for years; it's time for more SMBs to do the same.
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