The other party sends a 200 (OK) to accept the change.
The requestor responds to the 200 (OK) with an ACK. If the other
party does not accept the change, he sends an error response such as
488 (Not Acceptable Here), which also receives an ACK. However, the
failure of the re-INVITE does not cause the existing call to fail -
the session continues using the previously negotiated
characteristics. Full details on session modification are in Section
14.
本文详细介绍了会话修改过程中的关键步骤,包括200(OK)响应接受更改后的确认(ACK),以及当更改不被接受时的错误响应处理方式。即使重新邀请(INVITE)失败,现有会话也不会中断,而是继续使用之前协商的特性。
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