Last Modified: Oct 06, 2020
See more info
Known Affected Versions:
11.6.0, 11.6.0 HF1, 11.6.0 HF2, 11.6.0 HF3, 11.6.0 HF4, 11.6.0 HF5, 11.6.0 HF6, 11.6.0 HF7, 11.6.0 HF8, 11.6.1, 11.6.1 HF1, 11.6.1 HF2, 11.6.2, 11.6.2 HF1, 12.0.0, 12.0.0 HF1, 12.0.0 HF2, 12.0.0 HF3, 12.0.0 HF4, 12.1.0, 12.1.0 HF1, 12.1.0 HF2, 12.1.1, 12.1.1 HF1, 12.1.1 HF2
13.0.0, 12.1.2, 11.6.3
Opened: Jul 06, 2016
The branch parameter of the inserted VIA header is sometimes the same between an INVITE and ACK message.
SIP proxy servers which perform strict message validations may reject the call.
If the CSEQ number of a SIP message is the same, the inserted VIA header will contain the same branch parameter.
Included a hash of the branch parameter of the received top-most via header into the branch parameter of the inserted via header. Thus is the received top-most via conforms to the spec and generates a different branch parameter between INVITE and ACK, the inserted via will have a different branch parameter.