I added fake caps&features to Z-XMPP to simulate iChat’s AV support. List of the caps&features that I added:

this.features.push("apple:profile:bundle-transfer");
this.features.push("apple:profile:efh-transfer");
this.features.push("apple:profile:transfer-extensions:rsrcfork");
this.features.push("http://www.apple.com/xmpp/message-attachments");
this.featuresExt["ice"] = ["apple:iq:vc:ice"];
this.featuresExt["recauth"] = ["apple:iq:vc:recauth"];
this.featuresExt["rdserver"] = ["apple:iq:rd:server"];
this.featuresExt["maudio"] = ["apple:iq:vc:multiaudio"];
this.featuresExt["audio"] = ["apple:iq:vc:audio"];
this.featuresExt["rdclient"] = ["apple:iq:rd:client"];
this.featuresExt["mvideo"] = ["apple:iq:vc:multivideo"];
this.featuresExt["auxvideo"] = ["apple:iq:vc:auxvideo"];
this.featuresExt["rdmuxing"] = ["apple:iq:rd:muxing"];
this.featuresExt["avcap"] = ["apple:iq:vc:capable"];
this.featuresExt["avavail"] = ["apple:iq:vc:available"];
this.featuresExt["video"] = ["apple:iq:vc:video"];

And here’s what I get when I press call:
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