On Tuesday, May 22, 2018, 11:40:02 AM EDT, Alex Balashov <abalashov@evaristesys.com> wrote:

On Tue, May 22, 2018 at 03:34:23PM +0000, KamDev Essa wrote:

>  So append <sip:...>\r\n<sip:...>\r\n<sip:...>\r\n<sip:...>\r\n as needed?

No. Grammatically, your options are either:

  append_to_reply("Contact: <sip:abc123@host>;q=0.1\r\n"):
  append_to_reply("Contact: <sip:def456@host>;q=0.2\r\n"):
  ...

Or:

  append_to_reply("Contact: <sip:abc123@host>;q=0.1,<sip:def456@host>;q=0.2,...\r\n");