We've got a customer here in the UK with a UC320 with a SIP trunk with 10 DDI numbers. Incoming and outgoing calls work fine. What we can't do is make the UC320 generate the right SIP INVITE call to allow the trunk provider to show different outbound CLI on different extensions. The customer needs this as they have 3 or 4 businesses co-located in the building and right now all outbound calls are marked with the base DDI in the range.
The SIP provider can do this, if in the SIP INVITE the username portion is changed appropriately. However I can't find anywhere to make the UC320 do this. If I change the trunk settings, then trunk registration fails.
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