问题
I am sending an SMS with Twilio using the following TwiML code (from a bin). It is called at the end of a call, using the action parameter of the <Dial> verb.
<?xml version="1.0" encoding="UTF-8"?>
<Response>
<Sms from="+44XXXXXXXXXX" to="{{From}}">Recording of your call with {{To}}: {{RecordingUrl}}</Sms>
</Response>
It works, but if the message gets too long I get the error:
21605 Maximum body length is 160 characters
And I do not get Delivery Steps information in the SMS logs:
Delivery Steps
Delivery Steps are not available.
For messages sent with the deprecated /SMS/Messages Resource. Please upgrade to the Messages Resource to see Delivery Steps.
This link leads me to believe I am somehow using a deprecated API: https://support.twilio.com/hc/en-us/articles/223181028-Switching-from-SMS-Messages-resource-URI-to-Messages-resource-URI-
All the numbers involved are from UK, if this somehow has an influence.
回答1:
Twilio developer evangelist here.
It turns out that <Sms> under the hood, uses the deprecated /SMS/Messages endpoint to send messages during calls. This is why you are seeing the results you have shared above.
There is a bug open internally to provide <Message> within voice calls, but in the meantime the workaround is to use the REST API to send messages instead of TwiML.
来源：https://stackoverflow.com/questions/45020962/twilio-sms-sent-using-sms-limited-to-160-characters-and-without-delivery-step