Tags RELIABILITY

To provide reliable SIP failover -- do it slowly.

IP Fragmentation of SIP Messages is an enduring source of trouble. Fragmentation of SIP traffic is a problem on the rise. It appears when everything has been working fine, and seemingly without cause,  some SIP messages are lost in the network. The result is a frustrating scenario where some SIP messages are delivered fine, but others are not. To explain SIP fragmentation, let's start at the be...

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. It must select the proper IP address in...

Geographic Fault Tolerance for VoIP Carriers is a hot topic. The dream is to offer a telecom service that functions properly, even if half of the equipment is detonated. Fortunately, a VoIP Carrier far more likely to experience a simple network outage due to backhoe fade, or lose a building due to flooding, than they are to be attacked by gamma rays. Reliability is a key goal of professio...