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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.
 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.