Many thanks for the review and help with this!
> Is it only for SUBSCRIBE or is it required for INVITE as well or UE remembers
> it from the response to SUBSCRIBE?
This was just for the SUBSCRIBE which the P-CSCF itself originates, in UAC mode
(so not the proxied SUBSCRIBE from a UE). I think this could also be routed
through the I-CSCF, but I found that 3GPP said to skip that extra "work" (at
HSS also) and target directly the same S-CSCF which indicated itself in the
"Service-Route" header during registration.
---
Otherwise, for UE originated requests:
- The UE also might SUBSCRIBE to the same `reginfo` event at the S-CSCF, but
that would be another dialog. And all the initial dialog requests (a.i. first
SUBSCRIBE, first INVITE), or standalone ones (a.i. MESSAGE) should also use the
Service-Route, including, based on the UE's behavior, also the P-CSCF in the
route (some UEs might just force the outbound proxy without a Route, some add a
Route and do loose route).
- All the subsequent dialog methods from the UE should use the saved
Record-Routes for that dialog.
And in case the UE misbehaves, the P-CSCF must enforce all of these routes.
(e.g. the `pcscf_force_service_routes()` from `ims_registrar_pcscf` should do
it, respectively something similar from `dialog`/`ims_dialog`)
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