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<p>By the way....in case you aren't familiar with my services, I've been helping carriers of all types install and maintain their networks for the last 24+ years. I'm very familiar with TDM networks as I've helped over 200 companies install and or maintain their networks. The PSTN connection providers like Peerless, Inteliquent, and Wide Voice have been providing the SIP to TDM service for at least the last 10-12 years.</p>
<p>I've not only helped carriers interconnect with the ILECs and RBOCs, I've helped them move their TDM networks over to these PSTN connection providers. Your options would either to remain a CLEC and interconnect with a PSTN connection provider or become an interconnected VOIP provider so the RBOCs won't require the PSTN connection providers to install dedicated trunks for you. Both options require you to have a PSTN connection host for the RBOCs and ILECs who don't accept SIP trunks, but the advantage of being an interconnected VOIP carrier is that you can get licensed by the FCC once and cover most of the states. There are a few states like CA that still require you to apply for a CPCN, but most just require additional documentation when you order your NXXs.The benefit of Interconnected VOIP over leasing DIDs is that you are able to do your own porting and have more control over your network. </p>
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<p><span>MARY LOU CAREY </span><br /><span>BackUP Telecom Consulting </span><br /><span>Office: 615-791-9969 </span><br /><span>Cell: 615-796-1111</span></p>
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<p>On 2024-11-06 04:32 PM, Mary Lou Carey via VoiceOps wrote:</p>
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<p>How it works with Peerless, Sinch, and Wide Voice is that you get SIP trunks from them and they either add your NXXs to their trunks or they establish dedicated trunks for you to the RBOC. Verizon and Frontier allow the PSTN providers to add your NXXs to their existing trunks. AT&T and Lumen/Brightlink require them to establish dedicated trunks for your company. With transport that can be costly. If you get certified as an interconnected VOIP, then any of the carriers will allow your PSTN connection provider to add the NXXs to their network.</p>
<p>Another option would be putting TDM to SIP conversion equipment in a collocation that you rent or lease. I know it's possible because I've discussed the idea with some technical people. Anything coming from or going to the RBOC would be converted to SIP via equipment in the collocation. You may still need SS7 for that, but you could also order MF trunks from the RBOC. </p>
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<p><span>MARY LOU CAREY </span><br /><span>BackUP Telecom Consulting </span><br /><span>Office: 615-791-9969 </span><br /><span>Cell: 615-796-1111</span></p>
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<p>On 2024-11-06 04:00 PM, Mike Johnston via VoiceOps wrote:</p>
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<div class="moz-cite-prefix">On 2024-11-06 13:29, Chris Meilleur wrote:</div>
<blockquote style="padding: 0 0.4em; border-left: #1010ff 2px solid; margin: 0;">Is SIP to TDM media conversion a possibility? I've had to use that in a few locations where we are delivering T1 PRI's to customers for which a SIP expansion of their PBX is required but cost prohibitive, or not possible on the platform. That said, I haven't done any SS7 on them. </blockquote>
<p>Absolutely, yes. But that doesn't help with the SS7/ISUP problem.</p>
<p>With a typical T1 PRI with a customer, one of the channels is for signalling call setup.</p>
<p>But if Telco A has a bunch of T1s to Telco B, they wouldn't need to lose a channel on every T1 for signalling. They could instead, dedicate just one channel from one of the T1s for signalling, and the rest are for audio. (For improved redundancy, there should be two T1s that have a signalling channel on them.) When you have direct signalling between two carriers like this, it's called an F-Link.</p>
<p>But, for some reason, it seems rare for Telco A and Telco B to have signalling directly between each other. At least in my experience. The T1s they have between each other are for audio, and that's it. The signalling between them is instead handled by one or more third parties, which operate STPs (and probably SCPs, too). What they are selling you is called A-Links, which gets you a "default gateway" into the SS7 network. There is a good chance these STPs are not anywhere geographically near you. Telco A and Telco B could be just a handful of miles apart, but the signalling required to setup a call may travel all over the continent. If your A-Links are down, you won't be able to make calls to the neighboring telco, even though your T1s with them are up.</p>
<p>TDM is getting more and more expensive across the board. But what's happening most recently, is a huge increase in cost from the above mentioned providers, specifically for the service of signalling call setup between telcos (ISUP). Other common uses of the SS7 network include CNAM and LRN lookups, which are not seeing particularity noteworthy (i.e., fall out of your chair) price increases.</p>
<p>-Mike Johnston</p>
<p>[Corrections or improvements to any statements I have made above are more than welcome!]</p>
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