Avaya and Cisco have patched security flaws on their managed IP services, after a number of weaknesses were found in the system.
Security researchers warned businesses and managed VoIP providers of the threats of a number of attacks, causing the patches to be issued.
The weaknesses were identified as allowing remote code execution, unauthorised access, denial of service and information harvesting, according to VoIPshield Laboratories.
According to Rick Dalmazzi, president and chief executive officer of VoIPshield, an advisory from a third affected firm, Nortel, will be issued this week, reports ComputerWorld.
The flaws are ranked by the firm as either critical or high, meaning they are at the top of the four-scale severity system.
Avaya and Cisco said they are both releasing security packs and consumers will be issued with advisories.
VoIPshield said it had included the three firms in the testing as they show the bulk of sales in North America, adding that Microsoft would be included next time.
It was recently revealed that the number of people choosing managed VoIP services is increasing, causing more suppliers to offer them.
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