The present Recommendation is part 1 of a multi-part deliverable covering network integration testing between SIP and ISDN/PSTN network signalling protocols: Test suite structure and test purposes for SIP-ISDN;Abstract test suite and partial protocol implementation extra information for testing proforma specification for SIP-ISDN;Test suite structure and test purposes for SIP-SIP; Abstract test suite and partial protocol implementation extra information for testing proforma specification for SIP-SIP.