2050PC Avaya Nortel Softphone SIP-ALG 2050PC Avaya Nortel Softphone SIP-ALG bltodd (TechnicalUser) (OP) 29 Aug 23 16:17 Wondering if I can turn off or uncheck SIP-ALG setting from our firewall. Does the 2050 softphone require the SIP-ALG setting? Thank You! Bret RE: 2050PC Avaya Nortel Softphone SIP-ALG phonebits (TechnicalUser) 29 Aug 23 17:07 bltodd- The 2050 Softphone doesn't use SIP at all, so SIP-ALG on a router would have no effect on it. The call signaling is handled using Unistim, the standard Nortel proprietary VoIP protocol. No router even knows it exists, so there's no issues with them mangling the traffic.