DECT Phone For Home: Siemens A510 V. Grandstream DP715

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I have an asterisk server at home. I’m looking to replace my internal phones with sip cordless (DECT) phones. I’m now looking at the Siemens A510IP base ($90 ) and A510H handset ($40) and the Grandview DP715 base
($80) and DP710 handset ($45).

The Siemens has a feature were I can also use a PSTN landline, but I not sure that’s a great benefit.

Has anybody tried these phones? I assume they both integrate with asterisk since they both are sip.

I’m leaning towards Grandview. Seems to be easier to transfer calls.

A questions, I’m on a call with one handset, can another person pick up a second handset to make another call? can that person join the first call? In other words, do I need two base stations to make two calls?

Any suggestions? Thoughts?


10 thoughts on - DECT Phone For Home: Siemens A510 V. Grandstream DP715

  • I’ve been using the Gigaset A580 Base and A58H Phone for about 3 years now. Never gave me problems. The call Quality is excellent!
    I only have 1 handset connected to the Base but I want more. I bought a Linksys WIP330 as a 2nd phone to try out and that works just as good without a base unit.

    The A580 Base supports up to 6 handsets.

    I have 6 Incoming VOIP Numbers using separate SIP accounts pointed to 1
    Handset but you can point each SIP to separate handsets.

    The call goes to the first phone that picks up. When on a call, picking up another phone makes a separate call and does not conference. I don’t use conference yet but I know you have to put the call on hold or something.

    The thing I don’t like about the A580 and might be the same on all of them is that you can only specify 1 Sip Account for making outgoing calls. In other words, all 6 phones would use the same caller id out, but I wanted to be able to choose that because I have a business number and number for each person in our household. In order to use a different Caller ID (SIP Account) for making outgoing calls I added a extension to my Dial Plan and before making outgoing calls I press *1-6
    before the number.

    I’m going to try adding more handsets that are compatible. I want the SL78H but they are so expensive for just home everyday use.

    Make sure you check the compatibility page here before buying handsets.

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  • That is true about the A580.

    I don’t like the interface much to check messages.

    Besides that every time I go to dial a number…it always uses the first digit pressed to go into phone I have to press the first digit twice…

    I would test other phones but it’s for home and I can’t fork over $$ to try them all out….

    I have tested some Nokia cell phones, the N97, N900, and E71 and the E71
    and N900 worked well. I didn’t like the N97.

    Co-op Vacation Rentals
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  • Some stupid questions:

    I understand the A510 allows 2 sip calls. Let’s say you’ve registered the base with asterisk. A uses handset 1 to call out over sip. B picks up handset 2. Does B hear a dial tone? Can B dial out over the asterisk server?

    Or do you need two registrations with asterisk? In which case, is handset 2 always tied to the second registration?


  • I never hear a dial tone from my sip phones. I just pick up the phone and dial + send but you should be able to dial out using the same SIP
    account in use…but you will need at least 2 outgoing trunks with your SIP provider to call external numbers, unless your calling another extension.

    Just picking up your phone will not connect you to the call in progress on the other line.

    Co-op Vacation Rentals
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  • Using a Gigaset C610IP here, and am very happy with the features. The base station can handle two concurrent SIP calls, and another internal one at that. It does it with a single SIP registration to each server. You can setup multiple servers if you want to and define dial patterns/plans that determine which server gets used. After some playing around with it, I’m now using my setup connected to a single asterisk only. (Let asterisk make call routing decisions based on cost, using an AGI)

    Call transfer is working fine, the handsets have a Flash/R key to accomplish this. Using the Flash lets you start a second call, and once answered you can easily conference the second party in (softkey right on the screen), or transfer the call to the other party (via menu, then transfer). Using this capability, someone on a call can easily confer with another party, and bridge them into the call. AFAIK it is not possible for someone to join an existing call easily. You’d have to implement that in asterisk’s dialplan, not on the Gigaset phone.

    My understanding is that the C610IP has a few more features than the 510. I
    might’ve also read somewhere that the 510 is obsolete. Can’t find that link right now, but search (use the Gigaset tag to get some initial results).

  • Mebbe you guys should try snom m9 dect ip phone, i have been using it since over 3 years now without any of these issues.


  • At the risk of continuing off-topic conversation…

    Oh the M9 has it’s own issues, don’t you worry (not to mention it’s _way_ more expensive than the Gigaset range)!

    I’ve been testing the A510 today and I’ve decided I like it more than the A580. The software (via the web interface) looks more polished and overall thus far it has performed fairly well (with no annoying ‘new message’ statement!). I haven’t tried multiple SIP registrations with dual handsets yet, but I intend to. You guys realise these are standardised DECT handsets right? Ie that’s where the 6-handset limitation comes from, and you should theoretically be able to register other manufacturers’ handsets too.

    I’m about to try the C610IP model that Kai-Uwe mentioned (over the next few days). I think I’ll like even more than the A580 since it has a higher resolution colour display. And even then it’s still miles cheaper than the M9!

    Don’t get me wrong, I do really like Snom phones too, although the M9 hasn’t been entirely smooth sailing. I love the 320 desk phone (at the cheaper end of the scale, it has a great feel to it).
    Isn’t it great that they all interact with Asterisk so well (there you go, I’m on-topic again ;-).


  • Pete,

    Thanks for testing these out. You said you like the 510 vs 580. Which one is newer? I have the 580. I’m staying tuned for your review of the
    610. The 580 isn’t DECT compatible and only supports some of the Gigaset handsets. I might sell mine and upgrade depending on what you learn about it.

    Can you tell me a little more about what you are testing for?
    Simultaneous In/Outgoing Calls using 1 or Multiple SIP accounts. Conference Calling?
    Any other Features?

  • Hi Roy & others.

    Sorry for the delayed reply to this thread. The holiday period delayed my testing of the A510 and C610 range further, but I have now had a chance to give them a little ‘ear time’.

    My tests were just for basic functionality of the devices as normal run of the mill phones. I wanted to know for example, weather they had any annoying ‘glitches’ like the 580’s insistence on telling me “You have new messages” when there is only a missed call, or other practical usage issues.

    After testing the A510 and C610 my opinion is that I would go for the C610 any day. I suspect the A510 is a ‘newer’ release than the A580 (which seems to be EOL now), however I’m not entirely certain about that. The web GUI for the 510 and the 610 are visually very similar, but both are different to the 580. I suspect the 510/610 run a newer shared firmware which has evolved from the 580 (the 510/610 GUI gives hints of this and it looks overall far more polished than the 580).

    The 510 handset is quite basic (lower-res mono with coloured backlight). The 610 handset is visually similar to the 510 (although not the same), but more glossy and has a much nicer LCD (colour, higher res). I suspect the 610’s handset CPU is a little faster too.

    I’m surprised to hear you say the 580 isn’t DECT compatible. It’s manual indicates it supports both DECT and GAP, so should be able to take handset registrations from other brand handsets (and also register the Gigaset handsets with other DECT bases, if desired). Is this not your experience?

    I note that the range of other Gigaset handsets compatible with the 580 base is a reasonable list too, as shown at hte URL you provided:

    Your link indicates that the C610H handset can be used with your A580OIP base. I reckon that would be worth giving a try because the 610 is a nice handset and if it works with your bases then it might be a good solution for additional phones.

    I haven’t tested this at all with the 580, but I can confirm that the A510 and C610 do happily interoperate with each other (ie, I was able to register my A510H with the C610 base and then my C610H with the A510 base). Once the second handset was registered with the base, I created a second SIP account login definition and assigned the first account to the first handset and the second account to the second handset. You can define which handsets receive incoming calls on a per SIP account basis and also define which SIP account each handset will use for outgoing calls on an individual handset basis.

    The configuration options available on each model of base (510/610) appear to be identical. This is what makes me think they share a common firmware.

    Both handsets do provide notification for missed calls, but thankfully they can be configured via the base-station configuration to not flash their MWI led for this condition.

    What I haven’t tried (due to not having any) is registering a standard DECT cordless (one that comes with a PoTS analog base) to either of the Gigaset base-stations. If that does work OK (fingers crossed), these base-stations could be a great upgrade for households with existing analog DECT cordlesses.

    Anyway, to wrap up, a note on the other items you asked – I did test 2 simultaneous SIP calls on separate accounts (and also calling each other via the Asterisk server). I only tested with ulaw since that’s all we use on this server. So note that I haven’t tested running 2 concurrent calls using a CPU intensive codec; that would be interesting, but out of scope for what I’m looking right now. Call quality with 2 ulaw calls in progress is great, just as good as a single. I didn’t give 3-way conference any decent time testing I’m afraid. I did have a shot at it following the instructions in the manual on the 610 but seemed to only be able to effect a call transfer, not a 3-way bridge. But I really didn’t give that any decent time and I’m fairly sure that it was me doing something wrong there before moving on and not going back.

    I have both phones here for another fortnight or so. If there is something specific you want tested then let me know and I’ll see if I can oblige. Otherwise my recommendation is focus on the 610 for now – it’s a nice wee phone which isn’t all that much more expensive, and possibly able to be retro-fitted to your existing bases.

    Anyway, hope this post helps anyone wondering about this range of phones 🙂