| 摘要 |
When a mobile phone receives (402) a page from a base station, it determines (404) whether or not it is roaming. If roaming, it determines, from the page, which voice service option (VSO) is available from that base station, and uses it (112). If at home, it compares (406) its internal settings with the VSO, and accordingly either treats the page as though it were roaming or enters (408) EVRC mode. Similar decisions are made when the phone originates a call.
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