text stringlengths 0 152 |
|---|
Don’t worry about the rest of them. If you need ’em, you’ll know what they are or why |
you want to use them. |
CHANNEL() |
CHANNEL() allows you to interact with an absolute boatload of data relating to the |
channel. Some items allow you to modify them, while others will only be useful for |
reference (for example, peerip will allow you to read, but not change, the IP address |
of the peer). There are also channel variables that only work with certain channel |
types (for example, pjsip items can of course only be used on PJSIP channels). |
exten => 223,1,Noop(CHANNEL function) |
same => n,Answer() |
same => n,Noop(CHANNEL(name) is ${CHANNEL(name)}) |
same => n,Noop(CHANNEL(musicclass) is ${CHANNEL(musicclass)}) |
same => n,Noop(CHANNEL(rtcp,all_jitter) is ${CHANNEL(rtcp,all_jitter)}) |
same => n,Noop(CHANNEL(rtcp,all_loss) is ${CHANNEL(rtcp,all_loss)}) |
same => n,Noop(CHANNEL(rtcp,all_rtt) is ${CHANNEL(rtcp,all_rtt)}) |
same => n,Noop(CHANNEL(rtcp,txcount) is ${CHANNEL(rtcp,txcount)}) |
same => n,Noop(CHANNEL(rtcp,rxcount) is ${CHANNEL(rtcp,rxcount)}) |
same => n,Noop(CHANNEL(pjsip,local_uri) is ${CHANNEL(pjsip,local_uri)}) |
same => n,Noop(CHANNEL(pjsip,remote_uri) is ${CHANNEL(pjsip,remote_uri)}) |
same => n,Noop(CHANNEL(pjsip,request_uri) is ${CHANNEL(pjsip,request_uri)}) |
same => n,Noop(CHANNEL(pjsip,local_tag) is ${CHANNEL(pjsip,local_tag)}) |
CURL() |
CURL() is a simple yet powerful function that provides a one-liner method for resolv‐ |
ing URLs, which in many cases is all you need for a basic interaction with an external |
web service. |
exten => 224,1,Noop(CURL function) |
same => n,Set(ExternalIP=${CURL(http://whatismyip.akamai.com)}) |
same => n,Noop(The external IP address is ${ExternalIP}) |
If you need a more complex interaction with an external service, it could be that you |
are going to want an AGI program of some sort. Still, you can embed a ton of data in |
a URL, and for simplicity, CURL() is hard to beat. |
CUT() |
If you need to slice-and-dice your variables, you’ll find the CUT() function essential. |
The form is simple: |
CUT(varname,char-delim,range-spec) |
It can be visually tricky, as the delimiter character can be difficult to see nested in |
between two commas (for example, if the delimiter was a dot/decimal/period). Let’s |
Handy Dialplan Functions |
| |
185 |
expand on the previous example to see what it’s good for (and give you a visual exam‐ |
ple of how the delimiter can get lost in the syntax). |
exten => 225,1,Noop(CUT function) |
same => n,Set(ExternalIP=${CURL(http://whatismyip.akamai.com)}) |
same => n,Noop(The external IP address is ${ExternalIP}) |
same => n,Answer() |
same => n,SayDigits(=${CUT(ExternalIP,.,1)}) |
same => n,Playback(letters/dot) |
same => n,SayDigits(=${CUT(ExternalIP,.,2)}) |
same => n,Playback(letters/dot) |
same => n,SayDigits(=${CUT(ExternalIP,.,3)}) |
same => n,Playback(letters/dot) |
same => n,SayDigits(=${CUT(ExternalIP,.,4)}) |
Note that you call the CUT() function with the braces ${CUT()}, but |
the variable being referenced inside CUT() is defined without the |
braces. This is because we are naming the variable, not asking for |
its contents (CUT() will deal with the contents, so we just need to |
name the variable it will be slicing and dicing, and it will dive into |
what is stored there). |
IF() and STRFTIME() |
The combination of IF() and STRFTIME() is a powerful construct, and you will find it |
an essential part of your dialplan logic: |
exten => 226,1,Noop(IF) |
same => n,Answer() |
same => n,Playback(${IF($[$[${STRFTIME(,,%S)} % 2] = 1]?hear-odd-noise:good-evening)}) |
Wait...what?8 |
Let’s break this down (we’re going to indent the code in an odd manner in order to |
show the progression of the nested functions and operators): |
exten => 227,1,Noop(IF) |
same => n,Answer() |
same => n,Wait(.5) |
same => n,Wait(.5) |
same => n,Noop(${STRFTIME(,,%S)}) ; current time - just seconds |
same => n,Noop($[ ${STRFTIME(,,%S)} % 2 ]) ; divide by 2 - return remainder |
same => n,Noop(${IF($[ $[ ${STRFTIME(,,%S)} % 2 ] = 1 ]?odd:even)}) |
same => n,Playback(${IF($[ $[ ${STRFTIME(,,%S)} % 2 ] = 1 ]?hear-odd-noise:good-evening)}) |
8 There is a C language function named STRFTIME() that returns the current time as a formatted string. This |
works similarly to that. In fact, the format portion of the function takes the exact same syntax as the C func‐ |
tion. |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.