In some case to work with some particular sip vendor, it is required to change sips to sip in INVITE packet. This article shares the solution on how to achieve it by custom change in ssh.
Model: S-Series and P-Series PBX
Firmware: Not Requried
1, Access ssh of pbx by referring to this article.
2, For s-series pbx, create custom file in /ysdisk/support/customcfg/pjsip_custom.conf.
For p-series pbx, create custom file in /ysdisk/support/customcfg/pjsip_outreg_custom.conf.
3, Input below script in bold to custom file accordingly.
4, Create any extension in web interface and delete again, click on Apply.
5, Test call.