This has happened to me with XTS's before. It is a CO problem...usually pots lines coming from a provider's channel bank. The channel bank is very slow to recognize the line going "off hook" so it sends one more burst of 90 volt ringing. It is really ugly but the caller on the other end is not aware of it. This ring burst is more pronounced if the call is answerd on the speaker before the handset is picked up.

The Partner does not have the same kind of end to end connection that newer systems have. It is one of those systems that has a lag when answering a call....you have to say "hello" twice so to speak before the caller is connected. This lag also masks the ring burst.

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