Can I change SIP port?
Can I use my own SIP server name?
How many concurrent calls can be supported?
Why one-way audio or no-way audio problem?
Can I dial outside numbers directly?
Can I change default outgroup prefix '9' to another one?
Can I route the prefix '9' to local extensions?
Can I route calls to different external lines by dialing different prefixes?
What's about the rate to call xxx, such as to call U.S?
I forget my password, what shoud I do?
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