Have you tried enabling the SIP ALG? You need something that will handle translating to/from 192.168.1.101, as the mobile phone will try to connect to this IP. The SIP ALG will rewrite the c=192.168.1.101 to c=a.b.c.d, which the mobile would then use to connect to the phone. The PBX does not actually handle the data, as the RTP is set up between the two endpoints.
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