[sipcore] Support automotive call transfer scenarios in the IETF SIPCORE WG

"Kitty Huang(黄玉洁)" <kitty.huang@quectel.com> Tue, 13 June 2023 08:53 UTC

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From: "Kitty Huang(黄玉洁)" <kitty.huang@quectel.com>
To: "sipcore@ietfa.amsl.com" <sipcore@ietfa.amsl.com>
Thread-Topic: Support automotive call transfer scenarios in the IETF SIPCORE WG
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Date: Tue, 13 Jun 2023 08:53:01 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/sipcore/7Pru91RLrMOENXHH42ZR2Jyd7pA>
Subject: [sipcore] Support automotive call transfer scenarios in the IETF SIPCORE WG
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Dear SIPCore chairs and SIPCore members,

The new SIP response code helped us a lot. Here's an example from us in action.

sip_error_code is the open parameter for solving the voice call problem of Neusoft.

Customer requirement: Whether the call is hung up normally or abnormally can be determined based on the hang-up event information.

Original solution: The end_reason reported by the call information callback function in QuecOpen SDK identifies the hang-up reason. QL_VOICE_END_REASON_E has enumerated the normal hang-up reasons. The other values indicate an abnormal hang-up.

Problem background: The original solution cannot cover all voice call scenarios in the actual testing process, which caused wrong judgement when some calls were hung up.

New solution: Qualcomm suggests opening sip_error_code parameter to solve this problem. Only when the reported end_reason is CALL_END_CAUSE_PROTOCOL_Q850_ERROR (that is 318 in SDK), the system checks the value of sip_error_code. If sip_error_code is 16, it is a normal hang-up.

The attachments are the end_reason list and problem analysis conclusion.

-----邮件原件-----
发件人: sipcore@ietfa.amsl.com <sipcore@ietfa.amsl.com> 
发送时间: 2023年6月9日 16:29
收件人: Kitty Huang(黄玉洁) <kitty.huang@quectel.com>
主题: Confirm: sipcore@ietfa.amsl.com:ZILitAHb605V:RsyUDJ0gGALasABzZgo0cEhGwiJmQ756222CRQ


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