VoLTE: Why UE is not sending PCO option in attach request?

Question

Samsung UE is not sending PCO option during attach request and as a result P-CSCF discovery is not working?

Is there a specific NV item to be changed or any config change to be made? This is a commercial UE and OS is Android 5.0

Answer 1

Hello Alkesh,

The UE should request for DNS Address and PCSCF Address via sending PCO in Attach Request. The UE request with ProtocolId value 1 (for PCSCF Address) and 2 (DNS server address). But the ProtcolIDvalues will be empty. Since UE is asking these Values from network. Is this happening in your case? or UE itself not include whole PCO?
Hence NW will include these values in PCO while sending ActivateDefaultEPSbearerContextRequest Message.

Comments

NW expects PCO request from UE so when it doesn't get it does not send PCO in default bearer request

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Ok..So you dont have control on Network. I am not sure Alkesh better to ask Samsung Team

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thanks Anand for your help.
I suspect its UE issue so let see if we get new update or firmware.

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Yaa..That may help.