04-23-2020 03:28 PM
Hi, I am having a lot of problems getting 7911 and 7940 phones to register on Asterisk servers off site (over the internet). I have read that as of v8 of the SIP firmware, Cisco follows RFC rules different to other brands. While Polycom and Grandstream phones register without any problems, Cisco phones do not. They do, however, register over the local network on a test Asterisk I have in my lab.
After a week trying to make them register on the internet-based server, I have started to try to understand why Cisco phones don't register and other brands, do. I read an article on Cisco site that:
"Note that as of version 8.0(2)SR1 the phone sends UDP SIP requests from a high source port. This means that it will send from (for example) source port 50116 to SIP port 5060 on the SIP server. This is acceptable behaviour as per the SIP RFC, but it is different to the Cisco ATA and 7940 SIP software (and many but not all phones) and may have ramifications on your firewall rules if you are expecting the phone to send packets out from source port 5060 as well (as you may have with 7940 and ATAs etc). There are a few phones around which behave in the same way although most don’t – this is not a cisco specific behaviour and is NOT a bug.
04-24-2020 06:33 AM
Send me a PM and I can get you the 7.5 version for 7940/7960. From what I can tell there are no v7 for 7911. There are v8 and 9.
04-24-2020 06:45 AM
01-06-2022 11:39 PM
Hi.
Will you please tell the result?
01-24-2022 07:29 AM
Hello habibi.hpy
I managed to get 7911 to register over the internet with firmware v9.x. It seems v8 is the one that have the most issues. For the 7940/60, 7.x works and I managed to get it working with 8.x as well. Not sure if 9.x works on those, this has been a long time (original post was from 2020). The issue is the high ports. You have to create rules for the phone to be able to go through the firewall.
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