Наткнулся на совершенно рабочий sip-клиент для n97 в виде патча для прошивки v20:
Nokia indicated that SIP would be enabled on N97 phones with the release of v20 firmware, a feature that was expected to be delivered by many users. With no sip in v20 a few users on the Nokia discussion board took matters into their own hands and tried everything possible to get things working. The result is a perfectly working SIP client that works on WIFI and 3G.
https://winkstreaming.com/en/n97_sip/
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