I never used the function and I am not sure about its role/where is useful.

However, the current behaviour is correct if the received is added as header parameter -- enclosing it in quotes is ok there. Without enclosing it, there can be received=uri;transport=xyz, so transport becomes another parameter of the header, no longer part of received value.

Then: adding received="uri;transport=xyz" to URI in Contact is indeed invalid, but also removing the quotes is not ok. The transport becomes parameter to URI, not part of received parameter. In this case, the = has to be escaped.

But again, wonder when this is useful and if escaping is fixing it overall or breaks it even more so other parts need also patches.

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