Preferred SIP provider with a custom Trunk

[JuliusP_ICT]

I've been asked to enable a Simultaneous Ring, where the originator's caller id shows as ringing in a Queue/Ring Group and for an external number.

Using the 302 Deflection option on a "dummy" extension, works if the call goes directly to them, but if its in a ring group it doesn't obey the 302 deflection, even with "accept from ring groups/queues" enabled.

The SIP provider is asking for a "Diversion" header, can i add this? As in can i export their template xml, add a field for "Diversion" and then import as a custom provider? If so, would it look something like this:

<field name="ParameterOut" custom="" parameter="Diversion">$CallerNum</field>

 

[IPEVA]

Same issue here, but it seems 3CX decided Diversion header was obsolete (although they don't seem to support History-Info header), and 302 Redirect is clearly not acceptable for various reasons when you are also the trunk provider.

Diversion header is supported by ALL IPBX that I know, ALL hard/soft SBCs, ALL carrier trunk providers.

David