![]() ![]() Gigaset VoIP telephones behind various routers with Network Address Translation (NAT) Information on operating Gigaset VoIP telephones with NAT routers Provides port-forwarding guides for many popular routers. Your IT administrator, with your ISP's and device manufacturer's support, are best placed to provide in-depth assistance with your local network configuration. Note: We can only provide general guidance and recommendations about the setup and maintenance of your local network. With port-forwarding in use, please leave STUN disabled in your VoIP phone settings, with UPnP and SIP ALG disabled in your router settings. Each VoIP call will use an RTP port and an RTCP port. Please be sure to forward a range of RTP ports (and not only the phone's starting RTP port). Your port-forwarding rules should use the UDP Protocol. Next, please port-forward the Local SIP Port and Local RTP (Media) Port range used by each of your VoIP phones and devices. You should first of all configure your VoIP devices to use static IP addresses. If you still experience problems after testing with the recommendations above, you could give port forwarding a try. Or, if you're connecting your own router to a modem-router supplied by your ISP, a solution would be to place the ISP supplied router in 'modem mode'. One double-NAT solution would be to setup port-forwarding rules (see below and here). You'd also need to compensate for the effects of multiple NATs on SIP traffic. Where phones are registering from behind more than one NAT or router, please disable UPnP if your routers support it. Avoid the registration of VoIP phones and devices from behind more than one NAT or router.STUN will not work correctly with all NAT setups, and in some cases STUN may resolve some issues only to lead to others. The STUN Protocol is intended to help devices communicate from behind a router's NAT. Try using a STUN Server in the settings of your VoIP phone or device. Please click here for a help guide about local port numbering. When more than one VoIP phone or device is registering from the same local network (from behind the same router), please use different Local SIP Port and Local RTP (Media) Port values in the settings of each VoIP Phone.Įach SIP phone should use a successive SIP port like: 44160, 44260, 44360, etc (and same for the starting RTP port - 44104, 44204, 44304, etc.) Disable Stateful Packet Inspection, SPI, options in your router settings.Poorly implemented router SIP ALGs are a common source of issues with SIP VoIP. Disable SIP ALG, if it's implemented by your router.Always check for known issues, before changing internet service providers, routers or VoIP devices. Purchase models with ongoing support, from manufacturer's providing regular firmware and security updates. ![]() Make sure your router(s) and VoIP devices are using the manufacturer's most recent firmware versions. ![]() You may find that powering your phones off and on may temporarily solve issues. Issues due to your local network and its configuration may appear intermittently and unpredictably, sometimes only showing up after hours or days of problem free operation.
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