Using Kamailio 4.1.3 and now 4.2.3 I get a scenario that an incoming call from an Audiocodes Gateway (MP-114 or Mediant-1000) shows the call appearance on the Phones (Polycom VVX-310, VVX-410 and SPIP-650). When a phone picks up the call, the appearances disappear from the other phones.
The other side of that, when one of the Polycom's calls out, the line appearance act normally.
Used the latest kamailio.cfg with the additions of the module based configs from the 4.2 wiki.

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