If your SRK is registered to the Spark Cloud, then you can dial a SIP URI. If you've only been given an IP address, try sticking something and an @ in front of the IP, ie endpoint@ipaddress.
Wayne
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If that's the case, then the other system is likely a H.323 device, not SIP, so you'll need to have something in between them that can interwork the protocols.
Wayne
Please remember to mark helpful responses and to set your question as answered if appropriate.
The SRK endpoint does support H.323 if used as a Standalone unit (as per the original poster's query), or if registered to a Call Control Platform that supports H.323 (ie Cisco VCS), or, with something that can interwork between SIP and H.323 if it is registered to a SIP only Call Control Platform (CUCM / Spark Cloud / etc).
Wayne
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Endpoints registered to Spark purchased under MSRP pricing can't be converted to standalone endpoints, they only support bring registered to Spark. Endpoints purchased under GPL pricing can be registered to on-premise call control and/or operate standalone.
