Looks like Yeastar has something in their knowledgebase about it: https://support.yeastar.com/hc/en-us/articles/226529408-How-to-Add-P-Asserted-Identity-in-SIP-INVITE-Packet
Hope this helps
Be civil. Disagreements of varying intensities will happen, but particularly vitriolic attacks will be pruned from the discussion.
Do not promote or advertise for any business, service or product unless responding to a specific request for recommendations. This includes recommending a user change providers when they have not indicated they are interested in doing so.
Do not send private messages to users, or invite users to send you a private message, for the purpose of promoting or advertising a business, service or product.
Do not invite, encourage, or seek help with engaging in unethical or fraudulent activity relating to VoIP, such as call spoofing, robocalling and autodialers, or fraudulent STIR/SHAKEN attestation.
Looks like Yeastar has something in their knowledgebase about it: https://support.yeastar.com/hc/en-us/articles/226529408-How-to-Add-P-Asserted-Identity-in-SIP-INVITE-Packet
Hope this helps
Wow. I will have to try this. Thanks so much!