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A sidecar interface to register with XEP-0100 gateways.
Register with a gateway, as per XEP-0100 §4.1. This method does not allow for all the parameters that gateways can potentially have, and indeed doesn't even allow the required or allowed parameters to be discovered, but it should work in practice for nearly all gateways to other IM protocols.
Username and password are enough information to sign in to many IM protocols, and this method has a high "return on investment" in terms of being easy to implement and easy to write UI for.
The gateway (XMPP component) with which to register, e.g. "sip-transport.example.com".
The username with which to register, in whatever format is required by the specified gateway; for instance, this might be a number, the username part of a SIP URI, a complete SIP URI, etc.
The password with which to register.