GSM/3G User Manual
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Figure 6-10 Create a routing
For "ascending" Policy, if you choose 2 or more ports members, it will use first available
port to transfer sms. For this case, if umts-2.1 is availble, it will always use umts-2.1 to
trnasfer sms; Otherwise, it will use gsm-3.1 to transfer sms.