[OpenSIPS-Users] Opensips-cp 8.3.0 / Call to undefined function json_encode()

Hello I am struggling with OpenSIPS-CP 8.3.0 (.zip source) configuration on Centos 8.2 Opensips 3.1 uses port 8000 to interop with opensips-cp, but there are no tcpdump packets on that port. It turned out that i am getting following errors on php level: [30-Nov-2020 14:13:54 UTC] PHP

[OpenSIPS-Users] Injecting 'user=phone' in to SIP URI

Hi, As per NICC N1035 document section 6.2 the SIP URI must end with 'user=phone'. How can this be added to a SIP URI that doesn't contain it? Is using the add_uri_param() function ( https://opensips.org/html/docs/modules/2.4.x/uri.html#func_add_uri_param) the best way to do this - i.e.?