Use APKPure App
Get 22Call SIP - a stable sip client old version APK for Android
S 好用 、 稳定 的 sip 软 电话 客户 端łatwy w obsłudze klient sip
Support audio
Support G.729, Opus, PCMA, PCMU,AMR,AMR-WB,G.722.1,G.722,SPEEX,SPEEX-
WB,iLBC,GSM,ISAC,ISAC-WB codecs.
Support 20-party audio conference.
Support add/modify the SIP message headers.