Shenzhen Mass Communications: Common SIP error codes-Voice Bot(Outbound Bot)-阿里云帮助中心

This document describes common SIP error codes you might encounter when using an intelligent outbound robot and their solutions.

SIP code	Description	Symptom	Solution
403—Forbidden	The server rejected the request.	The call fails without any feedback or is disconnected immediately.	Verify that the called number is correct. If the number is valid, wait for one minute and retry the call. If the request is still rejected, contact Alibaba Cloud Technical Support through DingTalk (ID: cccsupport2). We will work with the partner to resolve the issue.
404—Not Found	A route to the destination could not be found, the number is unassigned, or the called number is a non-existent number.	The call fails without any feedback or is disconnected immediately.	Verify that the called number is correct. If the number is valid, contact Alibaba Cloud Technical Support through DingTalk (ID: cccsupport2). We will work with the partner to resolve the issue.
408—Request Timeout	The server did not respond within the specified timeout period.	The call times out because the called party does not answer. This can happen if the called party has enabled features like high-frequency blocking. A "Call timed out" voice prompt plays before the call disconnects.	Check your network connection, increase the timeout period, and wait one minute before retrying the call. If the request still times out, contact Alibaba Cloud Technical Support through DingTalk (ID: cccsupport2). We will work with the partner to confirm whether the call was subject to high-frequency blocking.
415—Unsupported Media Type	Unsupported media type.	The call cannot be placed.	Ensure that the voice codecs are compatible.
482	The number is on the partner's blacklist.	The call cannot be placed.	The partner has blocked the call because the called number is on a blacklist associated with your caller number. Contact Alibaba Cloud Technical Support through DingTalk (ID: cccsupport2). We will work with the partner to check if the number can be removed from the blacklist.
486—Busy Here	The called party is busy or has enabled high-frequency blocking.	You hear a busy signal voice prompt, or the system returns a 486 error.	To prevent user harassment, partners may impose the following limits on a single called number: Outbound call frequency limit: A limit on the maximum number of times the same number can be called per day or per month. Outbound call time window limit: A restricted time window for making calls, such as from 9:00 AM to 9:00 PM. Calls cannot be placed outside this window. If you encounter this issue, wait for a while before retrying the call. You can also contact Alibaba Cloud Technical Support through DingTalk (ID: cccsupport2). We will work with the partner to confirm the specific limits for high-frequency blocking.
487—Request Terminated	The called party is temporarily unavailable. This can be due to the party's phone being powered off, the number being a non-existent number, the service being suspended, or the call being rejected or blocked.	The call cannot be placed. A voice prompt may indicate that the phone is off or the number is a non-existent number.	If the called party's phone is off, wait for them to turn it on before calling again. If the phone rings unanswered for a long time, hang up and try again later. If there is no system prompt, the call may have been blocked. Refer to the solution for the 486—Busy Here error code.
480—Temporarily Unavailable	This can occur if the call times out, is rejected, the line is busy, or if the caller or called party has exceeded frequency or concurrency limits.	The call cannot be placed, or the phone rings for a while before the system returns a 480 error code.	Wait for one minute and then retry the call. If the call still fails, contact Alibaba Cloud Technical Support through DingTalk (ID: cccsupport2). We will work with the partner to confirm if the caller number has exceeded frequency limits or the partner's maximum QPS limit.
487—Request Terminated	The called party is temporarily unavailable. This can be due to the party's phone being powered off, the number being a non-existent number, the service being suspended, or the call being rejected or blocked.	The call cannot be placed. A voice prompt may indicate that the phone is off or the number is a non-existent number.	If the called party's phone is off, wait for them to turn it on before calling again. If the phone rings unanswered for a long time, hang up and try again later. If there is no system prompt, the call may have been blocked. Refer to the solution for the 486—Busy Here error code.
500—Server Internal Error	A partner service error occurred or the call was blocked by the partner.	The call cannot be connected.	Contact Alibaba Cloud Technical Support through DingTalk (ID: cccsupport2). We will work with the partner to resolve the issue.
503—Service Unavailable	This can occur if the call times out without an answer, is rejected, or encounters a route problem. It may also indicate that the platform's overall call capacity (CAPS) has been exceeded.	The call cannot be connected.	Wait for one minute and then retry the call. You can also contact Alibaba Cloud Technical Support through DingTalk (ID: cccsupport2). We will work with the partner to resolve the issue.
603—Decline	The account is in arrears, the caller number is invalid, or the number is on a platform blacklist.	The call cannot be connected.	Contact Alibaba Cloud Technical Support through DingTalk (ID: cccsupport2). We will work with the partner to resolve the issue.