No, the only one that knows your IP is your server. So your server knows your IP because you talked to it and the server knows the recipient servers IP because that's who you're sending to. And the recipient knows their servers IP but doesn't know your servers IP and doesn't know your IP. Now you can find the recipient servers IP by doing a ping obviously and they can find your servers IP that same way but they can't find your IP directly and you can't find their IP directly. Now, this may change for audio calls because that uses WebRTC, but I can't speak to that.