[Bug] Direct IP call works with certain menu sequence not others

[randomandy]

I am saving direct IP call addresses into the Local Contacts directory with the syntax sip:telnum@[ipv6address]. What is buggy is that this works great in one context and not others.

The following sequence works reliably:
Spkr -> Dir -> Local Directory -> All Contacts -> Contact select
A serverless direct SIP IP call is initiated, rings and connects.

However, using this sequence:
Menu -> Dir -> Local Directory -> All Contacts -> Contact select
The LCD displays as if calling, but there is no ring tone and the call doesn't go through and eventually times out. The other party hears nothing either.

I have also put SIP addresses into an XML file and tried selecting them there. "Detail" shows the correct SIP address, yet it fails identically to the above approach.

Conclusion: It looks like the SIP direct calling feature isn't fully integrated into the phone.

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T19P
Firmware Version 31.71.0.51
Hardware Version 31.0.0.0.0.0.0