[reSIProcate] How to extract parameters from Contact Header?

[Chuck Baker (chuckbak)]

I have the following Contact header:
Contact: <sip:1000 at 10.10.10.10:5060>;video;audio
I need to test whether the "video" and "audio" parameters are present.
How do I do this with resiprocate API?
The Resip Overview document describes how to get the individual contacts
via:
for (NameAddrs::const_iterator i = msg->header(h_Contacts).begin(); i !=
msg->header(h_Contacts.end(); ++i){
    const NameAddr& na = *i;
    ...;
But, how do I get parameters from the Contact line?
TIA!

Chuck

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