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Hello, I have installed a SPA-3000 as NCH recommended for the external line. I have configured SPA-3000 as NCH indicated in the website, incoming calls from the PSTN are received by the Internal IVR to allow the caller to select the extension who want to call. Everything works fine but: When an extension (For Example 300) is in a call on the PSTN and another extension (For Example 301)tries to call to the PSTN the fallowing happen: - Extension 301 receive a not available tone as espected but... - The active call on extension 300 is transfered to the Internal IVR. The calls continues as a 3way call: PSTN Leg, VOIP leg and Internal IVR. What can be cause this problem? Best regards and sorry my bad English because i speak Spanish.