Regression testing. The intent of regression testing is to ensure that a change such as those mentioned above has not introduced new faults.[1] One of the main reasons for regression testing is to determine whether a change in one part of the software affects other parts of the software.[2] Common methods of regression testing include rerunning previously completed tests and checking whether program behavior has changed and whether previously fixed faults have re-emerged.
Regression testing can be performed to test a system efficiently by systematically selecting the appropriate minimum set of tests needed to adequately cover a particular change. Session Initiation Protocol. SIP works in conjunction with several other application layer protocols that identify and carry the session media.
Media identification and negotiation is achieved with the Session Description Protocol (SDP). For the transmission of media streams (voice, video) SIP typically employs the Real-time Transport Protocol (RTP) or Secure Real-time Transport Protocol (SRTP). For secure transmissions of SIP messages, the protocol may be encrypted with Transport Layer Security (TLS). Deadlock. Both processes need resources to continue executing.
P1 requires additional resource R1 and is in possession of resource R2, P2 requires additional resource R2 and is in possession of R1; neither process can continue. A deadlock is a situation in which two or more competing actions are each waiting for the other to finish, and thus neither ever does. Smoke testing.