diff --git a/docs/API_reference/en/iotlib/net.md b/docs/API_reference/en/iotlib/net.md
index 4547c867643122dbe2a842e7124b3a1ceb4b0534..9a34fa24b7c16623b7f45394e91b6d9b6d4219a3 100644
--- a/docs/API_reference/en/iotlib/net.md
+++ b/docs/API_reference/en/iotlib/net.md
@@ -328,7 +328,7 @@ A tuple containing `(GW, LTE)` - Successful execution
 | `rssi`         | In GSM and WCDMA network, this value indicates Rx level and describes the received signal strength. 99 indicates unknown or undetectable. <br/>RSSI = RXLEV - 111. Range of RXLEV: 0–63. Unit: dBm. |
 | `bitErrorRate` | Bit error rate. Range: 0–7. 99 indicates unknown or undetectable. |
 | `rscp`         | Receive Signal Channel Power. Range: -121 to -25 dBm. 255 indicates unknown or undetectable. |
-| `ecno`         | 【Pilot channel参考参数名修改缩写】. Range: -24–0. 255 indicates unknown or undetectable. |
+| `ecno`         | Pilot channel. Range: -24–0. 255 indicates unknown or undetectable. |
 
 * Descriptions of  `LTE` :
 
diff --git a/docs/API_reference/en/iotlib/voiceCall.md b/docs/API_reference/en/iotlib/voiceCall.md
index a5617ecec43694f42c57a56174a094b7a3cfe32e..4f6a42af29037c2563c20db7640755e84c2c17f0 100644
--- a/docs/API_reference/en/iotlib/voiceCall.md
+++ b/docs/API_reference/en/iotlib/voiceCall.md
@@ -365,6 +365,8 @@ Sets DTMF tone.
 
 
 >This method takes effect only during a voice call.
+>
+>Multiple characters can be sent at a time (after 2023/9/12, a maximum of 6 characters can be sent at a time).
 
 
 
@@ -501,6 +503,8 @@ Sets up call forwarding.
 
 `-1` - Failed execution
 
+> ​	The call transfer function can be used only after the call transfer function is enabled for the sim card carrier.
+
 
 
 ## Switch Voice Channel
diff --git a/docs/API_reference/zh/iotlib/voiceCall.md b/docs/API_reference/zh/iotlib/voiceCall.md
index 8c4cc75555af4680ed4e11925f5d0270071646de..7b2671a6b15375bd9b6899811f352f2932ac748f 100644
--- a/docs/API_reference/zh/iotlib/voiceCall.md
+++ b/docs/API_reference/zh/iotlib/voiceCall.md
@@ -348,6 +348,8 @@ voiceCall.startDtmf(dtmf, duration)
 
 
 >该方法仅在语音通话过程中使用生效
+>
+>支持单次发送多个字符（2023/9/12之后单次最多发送6个字符。）
 
 
 
@@ -474,6 +476,8 @@ voiceCall.setFw(reason, fwmode, phonenum)
 
 设置成功返回整型`0`，设置失败返回整型`-1`。
 
+> ​	呼叫转移功能需要先向sim卡运营商开通呼叫转移功能后，启用呼叫转移才能使用。
+
 
 
 ## 切换语音通道