您正走在正确的道路上！优秀的研究。实际上，context.getTwilioClient（）是其中的一部分。初始化Twilio REST API客户端后，就可以使用另一个Twilio API来确定event.To中的FriendlyName。我在这里找到Filter IncomingPhoneNumbers with exact match。

下面是一种方法，当然可能还有其他方法。

const got = require('got');

// async function to deal with async REST API call

exports.handler = async function(context,event,callback) {

  const client = context.getTwilioClient();

  // await an async response
  await client.incomingPhoneNumbers
    .list({phoneNumber: event.To,limit: 1})
    .then(incomingPhoneNumbers => event.friendlyName = incomingPhoneNumbers[0].friendlyName)
    .catch(err => console.log(err));

  const requestBody = {
    personalizations: [{ to: [{ email: context.TO_EMAIL_ADDRESS }] }],from: { email: context.FROM_EMAIL_ADDRESS },subject: `New SMS message from: ${event.From}`,content: [
      {
        type: 'text/plain',value: `${event.Body} - ${event.friendlyName}`
      }
    ]
  };

  got
    .post('https://api.sendgrid.com/v3/mail/send',{
      headers: {
        Authorization: `Bearer ${context.SENDGRID_API_KEY}`,"Content-Type": 'application/json'
      },body: JSON.stringify(requestBody)
    })
    .then(response => {
      console.log(response);
      let twiml = new Twilio.twiml.MessagingResponse();
      twiml.message({to: '+1555xxxxxxx'},`You Message: ${event.Body} - ${event.friendlyName}`);
      callback(null,twiml);
    })
    .catch(err => {
      console.log(err);
      callback(err);
    });
};

特定于与事件对象关联的键，这是一个方便使用的键。

Object.keys(event).forEach( thisKey => console.log(`${thisKey}: ${event[thisKey]}`));