Home ▸ News & Events ▸ SIP Forum News ▸ Uncategorized ▸ Nortel Rejoins SIP Forum as Full Member Company Nortel Rejoins SIP Forum as Full Member Company December 7, 2008 The SIP Forum is happy to announce that Nortel has rejoined the Forum as a Full Member company! ← SIP Forum Releases SIP Test FrameworkThe SIP Forum Opens Registration for SIPNOC 2026 – The 15th Annual SIP Network Operators Conference →