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Adrian Georgescu, 12/08/2012 09:22 am

SIP Device Configuration

There are thousands of SIP devices on the market, for how to configure them we advise you to consult the support forum of the device manufacturer.

Please do not open a ticket related to how a particular device must be configured.

Setup your SIP device as follows:

SIP Account Credentials

Account credentials are used for authentication and authorization of SIP requests performed by the SIP device.

Your SIP address is replace XXX with the username chosen during the account enrollment.

Username XXX
Password YYY
Domain/Realm sip2sip.info

Register must be turned On in order to receive incoming calls.

If your SIP devices is smart enough, there is no need to set manually anything else than the above settings. If you need to manually fine tune the configuration read below.

Specific SIP devices configuration

Server Location

There are multiple SIP servers distributed in multiple geographic locations. To locate them, the SIP device must always perform DNS lookups as defined in SIP standard RFC3263 (NAPTR + SRV + A DNS lookups)

You must never set manually a host address or transport belonging to SIP2SIP server infrastructure into your SIP device as it may and will change over time. Your device must use DNS lookups instead of hardwiring any such settings into your SIP device.

For informational purposes, the servers are reachable at the following addresses, but again you must query the DNS to discover them as they may and will change in the future.

Host Port Protocol
proxy.sipthor.net 5060 UDP
proxy.sipthor.net 5060 TCP

TLS Settings

SIP2SIP servers have a X.509 certificate issued by RapidSSL corresponding to the proxy.sipthor.net hostname of the proxy. If the client does not RapidSSL certificate authority loaded, it may fail to validate the certificate. If the client allows it you can download the RapidSSL root CA into it. Turn TLS certificate validation off to circumvent the problem.

TLS as any other transport like UDP or TCP may not be always available, set your SIP device to use DNS to discover which transport is available.


If you use SIMPLE presence you need to set XCAP root:

XCAP Root https://xcap.sipthor.net/xcap-root/

MSRP Relay

If you use SIMPLE instant messaging based on MSRP, a relay is available for helping traverse the NAT. You need to use the relay if you are the receiving party and you are behind a NAT-ed router. The MSRP relays can be found in the DNS by using SRV lookup for _msrps._tcp.sip2sip.info.

STUN Servers

You may use STUN for ICE NAT traversal. The STUN servers can be found in the DNS by using SRV lookup for _stun._udp.sip2sip.info.

NAT Traversal

SIP2SIP infrastructure is smart enough to handle the NAT traversal for both SIP signaling, RTP and MSRP media sessions. Also it supports ICE negotiation in the clients and provides automatically a TURN relay candidate.

Practically, you should not set any NAT traversal features in the client as the chance of fixing things is much smaller than breaking them.

  • Do not use STUN for Register purposes
  • Do not set your client to discover a global IP address