3.2.5.3 Incoming-Call-Request Message

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Since the Point-to-Point Tunneling Protocol (PPTP) Profile does not allow a remote system to connect to the PAC over a PPP link, such as a dial-up link, the PAC MUST NOT send an Incoming-Call-Request message to the PNS. However, the PNS SHOULD handle this message, as specified in [RFC2637] section 2.9.