Why/When did Polcom phone AutoAnswer change again?

@wpns wrote:

So I've got:

voIpProt.SIP.alertInfo.1.value="Ring Answer"
voIpProt.SIP.alertInfo.1.class="ringAutoAnswer"
voIpProt.SIP.alertInfo.2.value="Alert-Info: Auto Answer"
voIpProt.SIP.alertInfo.2.class="ringAutoAnswer"

in a config file for my Polycom phones, because "Ring Answer" used to work, and then it was changed to "Alert-Info: Auto Answer", and that stopped working a few weeks(?) ago, so now I discovered it's "info=Auto Answer"

so I added:

voIpProt.SIP.alertInfo.4.value="info=Auto Answer"
voIpProt.SIP.alertInfo.4.class="ringAutoAnswer"

And now it's working fine again.

Any idea why/when this changed, and why it ever has to change, given that a change will break all(?) installed Polycom phones?

Thanks!

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