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