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What routers are incompatible?

See below for the known incompatible routers.

Important: Any router that cannot disable SIP modifications (e.g., SIP ALG, SIP Helper, or any other SIP modifier) will not be compatible with desk phones.
  • All routers with Tomato firmware
  • Apple Airport Routers
  • Buffalo Routers (All)
  • Cisco RV Series (All)
  • Comcast "Business Gateway" (SIP ALG is baked in)
  • D-Link DIR-632
  • Linksys BEFS-xxxxx (All)
  • Linksys BEFSR-xxxx (All)
  • Linksys EA series (All)
  • Linksys LRT224
  • Linksys WRT100
  • Linksys WRT120N
  • Linksys WRT54GL
  • Linksys WRT54GS
  • Linksys WRT54GT
  • Linksys WRT54GX
  • Linksys WRT610
  • Medialink MWN-WAPR150N
  • Netgear CG3000DCR (Comcast)
  • Netgear FVS
  • Netgear MR814
  • Netgear Nighthawks (All)
  • Netgear WPN824
  • TimeWarner Technicolor TC8715 (SIP ALG burnt in)
  • Verizon FiOS Quantum Gateway AC1750 (SIP ALG is baked in)
  • ZyXEL Router (All)
  • ZyXEL ZyWALL Firewall (All)
Note: Home-grade routers from D-Link and Netgear are suitable for 1-4 users with minor setting adjustments. Modem/Router combo devices or DSL/Cable Gateways (typically supplied by your ISP) are suitable for 1-4 users, but are not recommended. Set these devices to Bridge Mode and use a separate router for optimal results.
Article last updated: 9 May, 2023