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Please inform us if any routers you have found to be incompatible are not listed below.

Router MakeRouter ModelIncompatibility Rationale/Problems
TP-LinkArcher C7/C9 (AC1750/AC1900, respectively)No exposed SIP ALG toggling option in web interface
AppleA1354 (4th Gen Airport Extreme)No exposed SIP ALG setting, spottiness with handset stability
AppleA1408 (5th Gen Airport Extreme)No exposed SIP ALG setting, spottiness with handset stability
AppleA1521 (6th Gen Airport Extreme)No exposed SIP ALG setting, spottiness with handset stability
ComcastDPC3939BSIP ALG cannot be disabled, SIP traffic on port 5060 may be blocked on the router, DNS may need to be manually set to Google DNS (8.8.8.8, 8.8.4.4) for Polycom handsets as temporary work around

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