The following SIP headers cannot be controlled using relay or transparency flags in relay scenarios:

Accept-Language

Alert-Info

Also

Anonymity            

Authorization

Contact

Content-Length

Diversion

Error-Info

Event

Expires

From

Max-Forwards

Min-Expires

Min-SE

Path

P-Charge-Info

P-DCS-Billing-Info

P-K-Cfl

P-K-Cfo

P-Preferred-Identity

Proxy-Authenticate

Proxy-Authorization

Proxy-Require

P-Sig-Info

RAck

Reason

Record-Route

Remote-Party-ID

Reply-To

Requested-By

Require

Resource-Priority

Retry-After

RSeq

Service-Route

Session-Expires

Subscription-State

To

Via

Warning

WWW-Authenticate

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