[Linphone-developers] linphone-sdk iOS VoLTE

[Яровой Павел]

Good day.
I'm using linphone-sdk in my ios application. The application is 
designed to attract calls from multi-subscriber intercoms, which are 
usually located at entrances.
I ran into the following problem. It was discovered that registration on 
the SIP server does not occur when volte is turned on for one particular 
mobile phone operator. However, this problem is not stable and depends 
on the region in which the user is located.
It was found that when volte is turned on, this operator has two network 
interfaces, one of which does not have access to the Internet, 
therefore, when volte is turned off, the problem with registration 
disappears.
Attempts to search for information were unsuccessful. I would like to 
know if this problem is in linphone-sdk or my application, and if this 
is a problem in my application, then what am I doing wrong and where can 
I read more?

Thank you,
Yarovoy P.A.