If calls to and from all other numbers work perfectly fine, I would suspect an issue on your friend's end that's likely related to the SIP ALG feature in whatever router he's using. He should try disabling SIP ALG in it, if possible: https://www.obitalk.com/info/faq/sip-alg/disable-alg. If he's using an ISP issues modem/router combo, he should contact his ISP and ask about disabling SIP ALG in that device.sylvestor2002 wrote: ↑Jul 4th, 2017 1:24 amI'm have been using a LinkSys SPA-3102 for about 4 years. It has worked to make/receive calls. But I do have 1 strange problem which I can not figure out. I have a friend who uses Ooma. When I call his #, I can hear him but he can't hear me. He can call me and then we can hear each other. What setting do I have to tweak to resolve this problem ?
Otherwise, click freephoneline-ca-free-local-soft-phone- ... #p26808549, and go through the steps, in particular steps 3 through 12.