My ZoiPer app on my android phone was working fine until two days ago. I see it has updated to version 2.11.10 on Nov 28 2019 and now will not connect to one of my SIP server accounts. I upgraded it two weeks ago to allow multiple accounts. My Android version is 9.
I can connect when testing from a free Zoiper app on my Windows PC.
I can connect OK using a different SIP client app on my android phone (Sipnetic)
I think the latest Update from Zoiper has broken something. :-(
I am trying to connect to sip.crazytel.net.au