(In reply to comment #9) > OK, so just for extra-clarity: > > "TEL;X-EVOLUTION-E164=234:1234" in the 2nd contact should be > "TEL;X-EVOLUTION-E164=234:234" because it was parsed as a contact > interpreted with US locale. No. The part after the colon is always the original telephone number, which must not change. The part which must match the current locale is the parameter value (X-EVOLUTION-E164=234). So if the current locale is US, then X-EVOLUTION-E164=234 is correct. If it is DE, then X-EVOLUTION-E164=1234 is right. This applies to both test cases.