Background The Polycom SoundPoint IP SIP Phones and Adtran IADs are used for Hosted IP PBX Access Devices, managed by the BroadWorks platform. In a non-geographically-redundancy network, the devices use SIP to register to a single SIP SBC IP address. To support geographic redundancy of SBCs, the devices must support registration to multiple IP addresses. […]
Question: How do you make a display filter that filters out most RTP frames, but leaves a representative sample? Sometimes it’s convenient to see a sampling of RTP frames in Wireshark, without having to see 50 per second. Answer: Rather then see 50 frames per second for every RTP flow, how about one frame every […]
When you’re connecting to the rest of the world to make and receive phone calls, you have several design options available. Or, more precisely, your Voice Service Providers have many options available. VoIP via Layer-3 VPN MPLS is the way we see this implemented most commonly. In this case, the customer has a location and […]
The BroadWorks DBS, which includes Oracle, requires a distinct skill-set.
Net Neutrality: The technology, the argument, and the risks.
The Cisco Small Business SPA-500 series phones (such as the SPA-502G, SPA-508G) include a Cisco-signed SSL certificate. Until very recently, all of the Cisco SPA-500-series phones shipped were signed by a Sipura certificate. Sipura was the Korean company that was bought by Linksys before Linksys was bought by Cisco. Sometime after August 2013, Cisco Small […]
Testing out a new SIP Phone or ATA? You’re going to need criteria that cover all the bases.