Hello,
The CER/CEA messages are used just for connections between two peers diameter interface. Did you use FHOSS or IMS_DIAMETER_SERVER module? In both cases, you should not have any issue. Anyway what mandatory parameters do you mean exactly?
WIth Best Regards. Mojtava

On Tue, Mar 12, 2019 at 8:17 PM Pafel <pafels@gmail.com> wrote:
Hello, 

I am testing ims setup with kamailio 5.2 using the default configuration provided here: https://github.com/kamailio/kamailio/tree/master/misc/examples/ims/ . Тhere is an issue I am facing with cdp avp in request sent to hss. There are some missing mandatory parameters in capabilities exchange request like 257 host-ip-address for example. Any idea how to add it via icscf.xml or kamailio.cfg ? The same parameter is passed to hss with kamailio 5.1 using default ims configuration. I read cdp and cdp_avp documentation but couldn't understand if it is possible to add it. 

Regards,
Pavel Siderov
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--Mojtaba Esfandiari.S