Session Initiated Protocol (SIP) and Message-Based Load Balancing (MBLB)
Source: F5 Networks
At the service provider level, the number of VLAN, TCP (or UDP) port, and IP triplet combinations is affecting the Session Initiated Protocol (SIP). Between servers, where the VLAN, TCP port, and IP variations are limited, the ephemeral ports are constantly being pushed and overrun. Because of active SIP subscriber counts in the millions, the potential to use various combinations of IP addresses and ephemeral ports is not realistic. Providing a method to aggregate and disaggregate these communications into a single triplet - or as an individual stream of information - enables greater scalability, performance, and reliability, and relieves the strain caused by these limitations.