TLS/TCP won't be the issue here. SIP is only for 9.0+ as the 'voice' component wasn't available back on 8.1
On a couple particular builds, I found that using an IP address instead of a FQDN would stop the app working on iOS. Android devices worked fine. Also, IP address worked fine if only connecting from a local network, but as soon as I moved it to the public IP, it would fail.
our client recently reported that IPhone's status is available but they cannot make and receive calls. we had this worked about 2 weeks ago. do you think it's because of the FQDN?
if you want to have acces from external than something that you can resolve from external
try to take a look on iphone logs, i had a similar problem, in my case iphone cold not resolve IPO FQDN
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