Getting User-to-User in the Refer_to header

Hi Everyone,

I’m having trouble getting the User-to-User parameter in the Refer-to header of the REFER method.

I receive this header with the following format:
sip:2300@172.16.322.1:5060?User-to-User=44553544555555495f42594f;encoding=hex

I am using the SIPREFERTOHDR variable for this, but this variable only returns up to the domain:
sip:2300@172.16.322.1:5060

Cutting the User-to-User parameter that comes right after.

I would like to know how I can get this entire header with the User-to-User parameter.

Thanks in advance

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