[fix](sipaccount) allow to pass InviterOptions when making call

[areski]

It would be very practical if we can allow to control the InviterOptions, for instance to set SIP Headers when making calls.

Usage:

      const InviterOptions = {
        extraHeaders: [
          'X-Referred-By-Someone: Username'
        ]
      }
      sipAccount.makeCall(phone_number, InviterOptions)