Looking at your frames, the SIM900 outputs a PPP frame with HDLC address and control bytes, while the SIM5216 does not. I'm by no means a PPP expert, but just looking for PPP in wikipedia shows this:
/The Address and Control fields always have the value hex FF (for "all stations") and hex 03 (for "unnumbered information"), *and can be omitted whenever PPP LCP Address-and-Control-Field-Compression (ACFC) is negotiated*./ You should actually check if that is the case before calling SimCom tech support. Besides that, those two HDLC-like framed PPP frames containing an IPCP message are equivalent, you are being assigned an IP address and provided primary + secondary DNS addresses --
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