But the OP does 
(my response was intended for the OP)
Man, this problem is killing me. I just want to keep using my Speedphone; the rest isnāt that important. Time to read some moreā¦
Well you likely need a SIP base station for that purpose, that allow to register DECT phones (I simply assume your speedphone 10 is a DECT-phone).
Those should be DECT and cat-iq 2.x capable, so best conditions to (fully) interoperate with SIP DECT bases (or Fritz!OS as DECT base). But it does imply a 3-device split, modem, router with OpenWrt and SIP DECT base (using a 7520/ 7530 could combine modem and router into one OpenWrt device, but with little margins for future ftth performance), the SIP base will always need to remain running its OEM firmware.
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And using the Speedport as a modem and SIP base isnāt possible? By disabling Wi-Fi and everything else?
So here is how i understand things. The speedport can either operate as full router that terminates the PPPoE connection (which is needed for all traffic, including VoIP/SIP) or as bridged-modem where it simply bridges one ethernet LAN port with the DSL interface specifically it will not establish/terminate the PPPoE connection.
Since the SIP traffic is tunnelled inside the PPPoE tunnel, you really only can use the speedport's SIP base functionality when you configure the speedport in router mode.
You can operate the speedport as router and connect only the speedphone and your openWrt router. The naive implementation of this will result in double NAT which is not terrible but can be inconvenient (for port forwards you will need to configure both routers).
Personally, I went and bought a stand alone SIP base when all-IP telephony was introduced, so that I would be independent of the ISP router's telephony support, but that is just one way to approach this.
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one can always drop the "wired" phone completely...
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True, however Germnan ISPs typically do not offer pure internet contracts so you typically pay for "wired telephony" already (and often as flat rate for all national numbers). So I can understand the desire to make that cost actually do something potentially useful. (A decade ago mobile telephony prices in Germany were often still pricy, so an additional reason to stick to old school telephony, especially for a family).
Did you check for some cheap fritzbox as i wrote earlier? But be awere that those devices are built on ancient hw.
I actually looked and wasnāt that pleased with the resultsāonly 10-year-old hardware for around ā¬40, or newer models for ā¬75+ (the Speedport is available for ā¬30). The only other option I found was a new Fritzbox for ā¬370 that would work, but I wouldnāt want to void the warranty by installing OpenWrt. So, Iāll stick with the Speedport as modem.
Take a look on klein, i've got mine fritzbox for free there.
Mmmh, on kleinanzeigen.de I see Fritzbox 7520s for around 40 EUR (some cheaper most a bit more expensive). This model can be either used as SIP basestation behind the speedport as bridged modem, or can be flashed with OpenWrt and configured as bridged modem...
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Sorry for the late reply. The setup I'll be choosing is the Speedport as a modem, a dedicated SIP base station (likely not an old Fritzbox, but rather a dedicated SIP station), and a mini-computer as the OpenWrt router. I think this is the best option for me. Or are the Fritzboxes really that good? I feel like they might be a bit of a power hog.
I guess one thing pro FB-as-SIP-base is that AVM tries hard to make it reasonably easy to configure SIP/VoIP for the usual suspects, and there should be ship-loads of howtos googlable (is this a word?). But other than that?
Personally, I use a GigaSet SIP base+phone combination, that I bought a decade ago (12 years IIRC), and to my surprise the last update was 2023. But that was never guaranteed and seems to be an artefact of that consumer base station being identical to one of the SOHO offerings from GigaSet so I was riding the support-coat-rails of business customers, I guess.
With GigaSet's bankruptcy and AVM changing hands, I am unsure which option currently is most future proof, so maybe your approach of getting a dedicated SIP station from a reputable vendor is the best way forward.
AVM as phone supplier has one advantage, it combines SIP pbx, SIP ATA, DECT cat-iq 2.1 base (with dedicated support for some older gigaset handsets in addition), support for SIP desk phones, and mailbox/ fax into one system, in a quite user-friendly way and with okay'ish support cycles. While it might not excel at either, it's a pretty decent allaround solution for these phone features - and I'm not aware of anything that combines these feature which would be better or one step up (if there are, I'd really like to know).
While e.g. the gigaset n510 pro can be a good DECT base (for compatible handsets), it doesn't do any of those other features - and it's EOL now (and the late 2022 firmware update will be its last).
Both AVM and gigaset have changed ownership within the last year, so what the future holds is unclear for either of them. Gigaset has already dropped several model ranges, what happens with AVM remains to be seen.
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I will keep you updated on what I choose. It will probably be either an AVM router or a dedicated box (I'll choose the cheapest option).
Thank you for all your help.
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I think, in your case, a FritzBox, or a newer Speedport is the best solution. All openwrt solutions will have you to have either a separate dect base for telephon, or a separate modem.
That depends entirely on the OPs requirements. Users asking for an OpenWrt solution tend to know why they want OpenWrt (at least that is considered the baseline for discussions here).
Fritz!OS tends not to provide much (read just about 'any') configuration opportunities for VLANs, firewall settings (beyond a handful of plain port forwardings), DDNS (beyond myfritz), DHCP, local DNS filtering (e.g. adblocking), more complex VPN setups (apart from IKEv1 or wireguard, the later only in contemporary models on current Fritz!OS versions) or the more advanced installable options available for OpenWrt. Obviously it does work for many users and simple needs, but not necessarily for those with slightly elevated or 'uncommon' requirements. As the OP has already ruled out the "Speedport Smart 3" (the current device, deemed too slow) and "Speedport Smart 4" - and is asking for an OpenWrt solution, recommending Fritz!OS as all-in-one solution might not be very likely to be satisfying.
With OpenWrt, this will require a three-device setup, splitting $MODEM, OpenWrt-router and VoIP/ phone/ DECT capabilities into dedicated devices (two devices, for the VDSL2+super-vectoring/ profile 35b case and the Fritz!Box 7520/ 7530 used as modem+router on OpenWrt, but that's a special case). It is worth investigating if the existing "Speedport Smart 3" can be re-used either as pure modem (PPPoE pass-through, if it meets speed/ technology requirements for that purpose) XOR as VoIP gateway (this works quite nicely with Fritz!OS, but might-or-might-not be more problematic with speedport devices).
Hello, it's me again.
I did a bit of research again and found a good router (at least I think so). The only problem I have is with the Wi-Fi. Can I just replace the Wi-Fi card in it with a newer one that supports Wi-Fi 6 and use the mSATA without any problems? Or would an external access point be better? If so, at what cost?
At this point, I'm also considering buying a Fritzbox.
Can anybody help?
thanks in advance
Here is a datasheet; I hope it helps: https://objects.icecat.biz/objects/mmo_35342363_1490783544_6801_2100.pdf
You generally cannot.
- two cards would be needed (one for 2.4 GHz and one for 5 GHz)
- A wifi6 AP mode capable DBDC card is:
- bulky
- draws 3A on 3.3V (more than the futro can compile, hardware damage guaranteed)
- needs a bulky heatsink
- given the case in question, requires active cooling (aka fan)
- will probably cook itself and the futro to death anyways
The forum search will provide you more detailed answers to the above.