Lastest sipjs SessionManager userAgentOptions has displayName property which does not work in latest sipjs, but it works on old version

[md-riaz]

Describe the bug

The first registration is from sipjs 0.15.6, where the displayName property shows perfectly on fusionpbx and other registrations are latest sipjs.

this is the latest sipjs implementation code, i set the display name properly yet does not work