Accept a list of tuples as a parameter.

[alishir]

Some header parameters accept duplicate keys and duplicate keys replace in map, so I implement this patch.
Here is an example SIP header:

Contact: <sip:10@10.10.10.10:47473;ob>;+g.3gpp.mcptt;+g.3gpp.icsi-ref="urn%3Aurn-7%3A3gpp-service.ims.icsi.mcptt";+g.3gpp.mcvideo;+g.3gpp.icsi-ref="urn%3Aurn-7%3A3gpp-service.ims.icsi.mcvideo";+g.3gpp.mcdata;+g.3gpp.icsi-ref="urn%3Aurn-7%3A3gpp-service.ims.icsi.mcdata";+g.3gpp.mcdata.sds="urn%3Aurn-7%3A3gpp-service.ims.icsi.mcdata.sds"