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This is an old revision of the document!
There are a lot of SIP clients on the market to choose from, there are free soft clients, affordable soft phones, and hardware phones. Here is a list of available SIP client setup instructions:
Turn off any tricks in the clients that may try to open NATs and firewalls, such as STUN, ICE and UPnP. The Internet Gate is already SIP transparent in a proper and secure way.
Your product is equipped with telephony ports that enable you to use standard analogue telephones with SIP services.