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I'm working on getting two SIP servers to talk. An Asterisk box and a Zultys MX250 system. So far, things have been working pretty well. I can call from one of my Asterisk-managed phones to an MX250-managed phone and vice versa. However, there are some strange issues. If I call from an MX250 phone to an Asterisk phone, the conversation is ok, but there is a noticeable delay in the voice