sends a request to a STUN server to discover its public IP and port(s). There is a good explanation of how to do this for a large organization in the SIP.EDU cookbook. You can use your free OnSIP SIP account with any standard SIP application. I achieved this by first following the instructions here in Step 7, then, since I didn’t have an IP phone, I configured the OnSIP control panel to forward all calls to my “extension” to my PSTN phone number. In other words, somebody with an IP phone could dial my email address and my regular PSTN desk phone would ring. specify a server or an IP address, but SRV records include a port at that IP. 'Utilizing WebRTC allows for far greater flexibility than already. You can also register your SIP address on any SIP-based desk phone for free voice and video calling. In addition to managing the set-up of calls between SIP devices and. A SIP proxy sometimes also referred to as a SIP server or SIP proxy server is mainly used by a SIP network to do call processing, but that isn’t its only function. You can use your free OnSIP SIP account with any standard SIP application. Learn about SIP servers as defined by RFC 3261, including the SIP proxy, registrar, and redirect server. There are detailed instructions on the OnSIP website.īefore I got my IP phone working, SIP calls addressed to my email address would come to my POTS phone. To use OnSIPs SIP hosting, the zone file in the DNS SRV records of the. OnSIP comes with a free softphone application for mobile and desktop. The OnSIP control panel allows you to specify the domain name for your SIP account for yourself. Second, you must configure your SIP server to service requests addressed to your domain name. HostGator customer support modified the DNS records within a day, but didn’t get it working until the second attempt. So I sent the following email to could you add the following DNS SRV record to : For the type of account I have there, HostGator does not let you administer your own DNS. The DNS server for my domain name,, is HostGator, and my VoIP service provider is, so these instructions explain how to do it for this combination of DNS and SIP servers.įirst, you must configure your DNS to forward SIP requests for your domain name to your SIP server. For example, DNS for points to Google for email, to OnSIP for SIP and to for There is an excellent explanation of this concept at, together with links for how to add SRV records to your DNS at, and. The DNS records that specify where your emails go are called MX records the DNS records that specify where your voice calls go are called SRV records. If you have your own domain name, you can do this by adding records to the DNS (Domain Name Service) for your domain. But it is more user-friendly to use the same address for both email and voice calls. A SIP address looks exactly like an email address: If you are using a hosted VoIP service like OnSIP, the domain for your SIP server would normally be that, or whatever. So if you want a wideband call you must use the SIP addressing scheme. The problem with these numbers is that the network tends to assume that calls made using them are destined for the PSTN, and consequently encodes them using a narrowband codec like G.729 or G.711. Most phones are addressed with a phone number – technically called an E.164 number after the ITU specification that defines the world-wide PSTN (Public Switched Telephone Network) numbering scheme.
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