Linux实现ppp拨号4G模块联网全球APN之亚美尼亚（Armenian）

亚美尼亚拥有三个网络运营商：
VivaCell MTS (by MTS Armenia)
Beeline (by Veon)
UCOM (formerly Orange)
2G/GSM is on 900 and 1800 MHz, 3G/UMTS is on 2100 MHz (and 900 MHz on UCOM) like in the rest of Europe. VivaCell MTS started with 4G/LTE in 2012 on the 2600 MHz (band 7) and Beeline 2016 on unusual 450 MHz (band 31) and UCOM testing on 800, 1800 and 2600 MHz.

chat脚本配置
chat脚本主要用来通过AT命令完成4G模块的拨号过程

chat还有个常用的关键词为ABORT，这个关键词用于判断何时终止脚本，在AT交互过程中，模块发生错误，并且输出一些错误信息时，ABORT可根据设定的词，停止当前脚本。

以下脚本命名为“gprs-connect-chat”
修改gprs-connect-chat脚本
vi /etc/ppp/peers/gprs-chat-connect

网络运营商APN

VivaCell MTS (by MTS Armenia)

ABORT "BUSY"
ABORT "NO CARRIER"
ABORT "NO DIALTONE"
ABORT "ERROR"
ABORT "NO ANSWER"
TIMEOUT 120
"" AT
OK \rATZ
# Connection to the network
OK  \rAT+CGDCONT=1,"IP","inet.vivacell.am",,0,0
# Dial the number
OK-AT-OK ATDT*99#
CONNECT \d\c 

Beeline

ABORT "BUSY"
ABORT "NO CARRIER"
ABORT "NO DIALTONE"
ABORT "ERROR"
ABORT "NO ANSWER"
TIMEOUT 120
"" AT
OK \rATZ
# Connection to the network
OK  \rAT+CGDCONT=1,"IP","internet.beeline.am",,0,0
# Dial the number
OK-AT-OK ATDT*99#
CONNECT \d\c 

UCOM (rebranded from Orange)

ABORT "BUSY"
ABORT "NO CARRIER"
ABORT "NO DIALTONE"
ABORT "ERROR"
ABORT "NO ANSWER"
TIMEOUT 120
"" AT
OK \rATZ
# Connection to the network
OK  \rAT+CGDCONT=1,"IP","internet",,0,0
# Dial the number
OK-AT-OK ATDT*99#
CONNECT \d\c