Add AttrSIPTrunkHostName for SIP trunk host identification

[serhiynovos]

The purpose of this PR is to add sip trunk host name to sip participant attributes.

One of the use case for multi PBX systems. For example there can be a few PBX which works separately and on call we want to know that call was done exactly from this PBX as we have to associate caller phone number with our users table to show that this specific person is calling. Having AttrSIPHostName will not work in all cases as these PBX can be under the same firewall so when they make calls to us we will see one firewalls public IP address. In this case we can one PBX configure to make calls to sip1.example.com and second to sip2.example.com and based what domain name is called we can make get what exact PBX was calling us

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