Calling number doesn't include 0 Prefix from Sip trunk in phone directory.
I have a sip trunk configured from CUCM to ISP.
For incoming calls I have configured Prefix "0" on Calling number for all calls on SIP Trunk configuration page. It is applying on the phone screen when a call is incoming, but it is recording without "0" on the phone directory.
I tried use CSS instead of prefix on SIP trunk configuration page. Also I configured a Calling transformation CSS on phone configuration page to prefix 0 but still the same. The calling number is not recording with prefix "0" on the phone.
The version is 10.5. I remember have configured this before and work. I don't know why now it is not working.
Since you don't want to localize the number again on phone (call logs), don't apply Calling/Remote Party Transformation CSS on phone.
As you want to add prefix '0' to all numbers, simply create Calling Party Transformation Pattern as '!', add prefix '0' and keep it in separate partition and assign this partition to relevant CSS. Apply this CSS as Calling Party Transformation CSS on SIP Trunk page (Incoming Calling Party Settings). Uncheck device pool CSS.
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