October 2017 - VoiceOps - lists.voiceops.org

SUBSCRIBE/NOTIFY method for CNAM querying
by abalashov＠evaristesys.com Nov. 17, 2017

Nov. 17, 2017

Hello, SIP redirects are the generally accepted transport for generic data queries (e.g. LRN dips, CNAM) over SIP. However, there is another method, which is used by Metaswitch, Sansay, and possibly some other softswitch vendors: the SUBSCRIBE-NOTIFY method. This is one in which an ephemeral presence subscription (i.e. with an Expires: value of 0) is created by the querying switch, and the CNAM gateway returns a NOTIFY some time later containing the CNAM data reply some time later in its body. The most complete explanation, including some limited insight into design rationales, is available from Neustar, who offer this query method: https://www.neustar.biz/resources/cnam/data-services-lidb-user-guide.pdf See Chapter 7 - IP-CNAM Speification (page 25). This is a weird and, in my opinion, ill-conceived mechanism[1]. Nevertheless, it is widely implemented. What I can't seem to figure out is where the formal definition of the standard comes from. It's certainly not an IETF RFC. The Metaswitch CFS provides a hint: MetaSphere CFS and Metaswitch MGC support performing Caller Name Database (CNAM) lookups by sending SUBSCRIBE messages to a database server, and receiving NOTIFYs containing the caller name. The specification of this interface is non-Metaswitch proprietary information. However, example message flows are shown in A.4.16. Whose proprietary information? I found this Verizon patent: https://www.google.com/patents/US20080240383 But it appears to be concerned with an adaptation layer of this to the ISCP side, though I only skimmed it. And if this is the patent in question, why don't any footnotes in vendor docs refer to it? The footnotes cite the SIP event pub-sub framework (RFC 3265) and little else. What the heck is it? And why did it get to be preferred over redirects for some vendors, especially given that it invokes ? but ultimately foregoes ? most of the bureaucracy of the event subscription mechanism, in a way that's seemingly contradictory. -- Alex [1] For one, it uses attributes in the encapsulated payload which look like headers, but aren't headers: Calling-Name-Status: available Calling-Name: ?Joe Smith? <sip:9726840623 at cnam-subscriber.com;user=phone> Presentation-Indicator: allowed Why bother with an encapsulated body, then? [2] More objectively, a SUBSCRIBE creates a dialog. But if the lifetime of the subscription is zero (expires immediately), presumably the dialog it creates also ends immediately. Why, then, does the NOTIFY have to be structured as an in-dialog NOTIFY (i.e. same From/To tags as the SUBSCRIBE)? -- Alex Balashov | Principal | Evariste Systems LLC Tel: +1-706-510-6800 / +1-800-250-5920 (toll-free) Web: http://www.evaristesys.com/, http://www.csrpswitch.com/

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Cisco acquires Broadsoft for approx the GDP of Belize
by ryandelgrosso＠gmail.com Nov. 3, 2017

Nov. 3, 2017

https://www.reuters.com/article/us-broadsoft-m-a-cisco-systems/cisco-buys-b… I cant say im surprised but in this day and age i suspect there will be far less technical synergies than anyone is hoping for. I suspect this bodes best for Metaswitch and netsapiens as some SP's will undoubtedly reconsider BSFT as a platform strategy. Also directly from the article: ??? ?? "BroadSoft provides software and services that enable mobile, fixed-line and cable service providers to offer so-called unified communications over their internet protocol networks." ... ouch Any other thoughts?

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Netsapien reviews
by matthew＠corp.crocker.com Nov. 3, 2017

Nov. 3, 2017

Hello, I?m a Broadsoft Broadworks shop but I?m looking at alternatives, Not a YUGE fan of Cisco? If you have an opinion on NetSapien as a HostedPBX platform (good, bad, ugly) please send to me on or off list. Thanks -Matt -- Matthew Crocker Crocker Communications, Inc. President

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Chinese language phone scam cals
by jaybinks＠gmail.com Oct. 27, 2017

Oct. 27, 2017

I've become aware of scam calls targeting seemingly random numbers with chines language voice recordings supposedly saying they are from the Chinese Embassy. The current flavour of this message is something similar to "This is the Chinese Embassy, you have an important message to be collected. If you have any questions press 0. Our Chinese language department will be able to assist you." I've found the following in the media about this, so it seems to be fairly widespread. - https://www.3aw.com.au/chinese-phone-scam-targets-australian-numbers/ - http://www.cbc.ca/news/canada/british-columbia/chinese-embassy-phone-scam-1… - http://dailyhive.com/vancouver/chinese-phone-scam-vancouver - http://news.xinhuanet.com/english/2017-08/10/c_136513524.htm I know of people receiving 10000 calls per day, and I've personally been seeing 5000 calls per day apparently for this scam. The caller ID is probably spoofed, but it appears to be spoofed within the one 1000 block of numbers. ( that I'm aware of, so far ) I guess id like to know if anyone else is seeing this, and what if anything, do we know about this scam so far? -- Sincerely Jay

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Android Spam Call Flagging
by ivan.kovacevic＠startelecom.ca Oct. 25, 2017

Oct. 25, 2017

Anyone have any details with respect it works under the hood and whether there is an API to add/report/remove numbers? (understanding that removal may not be something they allow? ) Companies like TrueCaller offer an API. Google has been offering spam flagging as a part of the Phone app, yet there is very little info out there? Is Apple doing something similar? Thanks! Best Regards, Ivan Kovacevic Vice President, Client Services Star Telecom | www.startelecom.ca <http://t.sidekickopen05.com/e1t/c/5/f18dQhb0S7lC8dDMPbW2n0x6l2B9nMJW7t5XYg1…> | SIP Based Services for Contact Centers | LinkedIn <http://t.sidekickopen05.com/e1t/c/5/f18dQhb0S7lC8dDMPbW2n0x6l2B9nMJW7t5XYg1…>

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ICTFAX - configuration
by igoldstein＠telego.net Oct. 24, 2017

Oct. 24, 2017

has anyone successfully configured ICTFAX on centos ? i am trying to follow the guide, and im stuck with getting the SIP Trunk registered, I want to register the ictfax to a SIP Trunk, I have the trunk information, (host, username, password) but in the GUI it is asking for other information which I don't know what it is, for example the "Dial String" and the "Register" field. Username, I assume is the username used for the SIP Registration Password, I assume is the password used for the SIP Registration Host, I assume is the Server Address, can I use a Fully Qualified Domain Name in this field ? or it has to be a IP Value ? Port, I assume I enter for example 5070, or whatever port the SIP Server is set to listen on add prefix, it has 00 in it. I assume I don't need this, unless the SIP Trunk carrier is asking to prefix all calls with a special value Dial string and Register fields i dont know what to put in there, and leaving it blank does not register the SIP Trunk -- Izzy

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SIP mobile client supporting TLS client authentication
by ldardini＠gmail.com Oct. 13, 2017

Oct. 13, 2017

Hello, I am looking for a SIP mobile client (android/iOS) supporting TLS with client authentication, so I can require a client certificate to be installed on the phones. Any idea on application name? Leandro

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SDWAN for VOIP
by David.Hiers＠cdk.com Oct. 4, 2017

Oct. 4, 2017

Hi, Is anyone else using SDWAN for VOIP? We can move a call between links and impose 10% packet loss and the users pretty much don't notice anything. No loss of call control or mid-call signaling, barely detectable impact on audio quality. This is pretty much the only way we've found to deliver the quality that our (very demanding) customers require using a 'bring your own bandwidth' model. It has been such a game-changer for us that I'm being sent to SIPNOC to give a talk about it. David ---------------------------------------------------------------------- This message and any attachments are intended only for the use of the addressee and may contain information that is privileged and confidential. If the reader of the message is not the intended recipient or an authorized representative of the intended recipient, you are hereby notified that any dissemination of this communication is strictly prohibited. If you have received this communication in error, notify the sender immediately by return email and delete the message and any attachments from your system.

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