Two out of the three answers provided by your account looked like spam, matching the following heuristics:
- Heavily promoted a single product, service, or vendor.
- Contained multiple links to a commercial site, matching common SEO patterns.
- Contained little or no direct technical information within the post body.
- Consisted, primarily, of a call-to-action to visit the aforementioned sites.
There were also other issues with your answers which were not specific to spam, but were indicative of abnormal behaviour:
- The two offending answers were literally identical.
- You linked to another answer of yours on Unix SE, which also heavily backlinked to the same vendor, though which did contain more technical details. This is usually done by people who are trying to farm reputation, rather than spammers.
That being said, it doesn't mean you are a spammer. Your behaviour was indicative enough for you to be concerning, but the fact that you replied and the fact that some basic osint shows you're probably not an employee means you're (probably) off the hook on this one. However, it is customary when recommending a commercial solution to explicitly and transparently state any affiliation you have with the vendor, paid or otherwise. I would suggest you caveat all of your future answers that reference Linphone as such.
As for what happened to your answers, they have been soft-deleted and can only be read by 10k+ reputation users who explicitly view the revision history. This is a safety measure to prevent gaming of the SE system by spammers.
For transparency, I'll quote the answers you gave (sans links):
You can use Linphone to place secure calls. It supports:
- HD Audio and video call
- Secure communications (TLS, SRTP, zRTP)
You would need to use a SIP service that supports authenticating and
transporting traffic through TLS (not all do), like Linphone SIP
service or Ostel.
For detailed instructions on how to set up secure calls with Linphone
As a closing word on the matter, I'd like to point out that these measures are taken to ensure that StackExchange is a good resource for solving technical (and non-technical) problems for everyone. It is better to err on the side of caution and have a few false positives with these things than it is to let spammers run riot. Signal to noise ratio is critical in making StackExchange useful.
If you were literally just posting about a solution that you had experience with, then I'm sorry you got flagged incorrectly, but I hope you understand that it wasn't intended to be an attack on you specifically. We like people to stick around, enjoy themselves, and contribute quality answers, which is one of the reasons we take abusive behaviour so seriously.