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What is the State of the Art in VoIP Network Design?
by lindsey＠e-c-group.com Jan. 11, 2011

Jan. 11, 2011

It's best for the Science and Art to have a public discussion about VoIP network designs. What was once an incidental installation task is often recognized as a key activity with serious cost implications. But still, many networks are never designed -- they just happen. IP Networks do not -- by default -- work well for VoIP. We the industry should document the current state of the art for the design of VoIP Networks. The need is greatest in carriers and large enterprises networks, but the design of networks for VoIP at all scales is interesting. Please help me document the standard industry practices in VoIP Network Design, both of new networks and also the expansion and evolution of existing networks. Your responses will be analyzed and compiled into a publication that will be submitted for conference publication. I hope to hear from vendors such as Acme Packet, Audiocodes, BroadSoft, Cisco, Digium, Genband, Metaswitch, Sonus, Taqua, and others. But I especially want feedback from individual designers & integrators. Everything you provide will be published online and credited. Responses received by February 15, 2011 will be used for the paper submission. My employer, ECG, Inc. is a for-profit entity, but this project is NOT a commercial enterprise. We wish to foster and sponsor innovation in VoIP networks in an open, free academic dialog. Mark R Lindsey, ECG Inc. mark at ecg.co | +1-229-316-0013 | http://ecg.co/lindsey ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ VoIP Network Design Survey. Please respond to lindsey at e-c-group.com A. If you would be willing to submit reference network designs for publication, please send them in PDF format. [VNDS1-A] B. Please provide answers to the following questions -- as much as possible. Even if you only have time to answer one question. [VNDS1-B] Q-1. What application-layer (VoIP) network devices do you regularly design with? What are special network requirements of each device? [VNDS1-B-1] Q-2. Where do you use public IP addresses, and where do you use private IP addresses? In each case: why do you use that type of address? [VNDS1-B-2] Q-3. How do you handle customer-premise access devices behind NAT? [VNDS1-B-3] Q-4. How do you handle peering ("SIP trunks") between carriers? (e.g., SBC? Separate IP assignment per endpoint? Separate Port assign nment? Authentication?) [VNDS1-B-4] Q-5. How do you guarantee network capacity for VoIP Media traffic? ...for VoIP signaling traffic? [VNDS1-B-5] Q-6. Are you designing to support SIP over TCP or SCTP? If so, why? If not, do you address fragmentation of large SIP? [VNDS1-B-6] Q-7. How do you describe your approach to network security boundaries? How do you enforce these boundaries? (Common approaches: firewalls, SBCs, VRFs/routing domains, server packet filters, private IPs and routing policies, etc.) [VNDS1-B-7] Q-8. What are the key security or operational threats that you design to protect against? [VNDS1-B-8] Q-9. What are the key network design principles for VoIP Networks that you follow? [VNDS1-B-9] Q-10. What are the key mistakes you try to avoid in VoIP Network design? [VNDS1-B-10] Q-11. What future trends in network design and requirements do you anticipate? [VNDS1-B-11] Q-12. What are your tightest constraints in your network designs? (e.g., Design time? Testing/Stability/Change Control? Rack space? Network link capacity? Money? CPU Capacity? CAM space?) [VNDS1-B-12]

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Adtran 924 PRI
by lists＠iamchriswallace.com Jan. 11, 2011

Jan. 11, 2011

We typically don't have issues with these lines. We just make sure to force G.711 and enable modem pass-through. ---Chris On Jan 10, 2011, at 7:58 PM, Dane Jasper wrote: > What about support of credit card processing machines? We've got Adtran TA5000 units deployed serving POTS which seem to be incompatible with many units. > > -Dane > > > Chris Wallace wrote: >> Great box and you can't beat the price, handles both PRI and CAS T1. Also supports T.38 on the analog ports and works quite well now that the software bugs are worked out. We have well over 100 of these units deployed and have no complaints. >> >> ---Chris >> >> On Jan 2, 2011, at 9:35 PM, Eric Hiller wrote: >> >>> Does phone equipment see the Adtran 924 PRI as a true PRI? Ie. can this be >>> used in place of a true PRI? Are there any hangups I should know about? I >>> was just going to use this to provide PRI to a customer over SIP rather >>> than have to run a PRI as well. >>> >>> Any advice with the 924? >>> -Eric >>> >>> _______________________________________________ >>> VoiceOps mailing list >>> VoiceOps at voiceops.org >>> https://puck.nether.net/mailman/listinfo/voiceops >> >> >> _______________________________________________ >> VoiceOps mailing list >> VoiceOps at voiceops.org >> https://puck.nether.net/mailman/listinfo/voiceops >> > > -- > Dane Jasper > CEO & Co-Founder > Sonic.net > Sonic Telecom > dane at corp.sonic.net > 707-522-1000 x2205 >

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Growing attack pains
by sil＠infiltrated.net Jan. 10, 2011

Jan. 10, 2011

I'm in the market for something to place in front of an SBC (modules would be nice, e.g., Asterisk module, Avaya module, etc.) The device will need to do the following: Block on N ... Block N amount bad attempts indefinitely and alert Block on Prefix ... If PREFIX is anywhere in SIPURI/ANI/CID, block (country specific would be nice) We are having a hard time keeping up with the attack vectors here. We recently saw a compromise from Egypt where the password was 15 characters mixed numbers, letters and symbols. So obviously longer passwords aren't even an issue anymore. -- =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+ J. Oquendo SGFA, SGFE, C|EH, CNDA, CHFI, OSCP, CPT "It takes 20 years to build a reputation and five minutes to ruin it. If you think about that, you'll do things differently." - Warren Buffett 227C 5D35 7DCB 0893 95AA 4771 1DCE 1FD1 5CCD 6B5E http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x5CCD6B5E

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Adtran 924 PRI
by clec＠cygnustel.com Jan. 10, 2011

Jan. 10, 2011

Does phone equipment see the Adtran 924 PRI as a true PRI? Ie. can this be used in place of a true PRI? Are there any hangups I should know about? I was just going to use this to provide PRI to a customer over SIP rather than have to run a PRI as well. Any advice with the 924? -Eric

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Combination bug EdgeMarc/Polycom?
by owen＠impulse.net Jan. 9, 2011

Jan. 9, 2011

Hello Voice-Ops, I have a frustrating situation where a random 1% of PolyCom phones (Mix, but all running 3.1.1) behind EdgeMarcs (VRRP 9.1.9) configuration are losing registrations overnight after a failed boot server check-in. (FTP) Phone will be URL call disabled until reboot or 12 hour+ wait. Inbound calls still work, outbound calls fail. Registration from a packet level is normal. Scenario is complex, but repeatable at multiple client sites. (so not firewall/lan) wireshark, tech support, release codes, ftp logs, and boot logs are all unhelpful/empty, and the firmware code (s) we're running can't be changed without proof, which at this point can only be generated by a fun weekend spent rebooting a cluster of phones over and over again, which for an annoying bug seems excessive. Bit of a rim-rock. Anyone seen anything like this? Cheers, Owen R. ____ Senior Network Engineer Impulse Advanced Communications 805-884-6332 owen at impulse.net

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Terminating LD Traffic
by clec＠cygnustel.com Jan. 9, 2011

Jan. 9, 2011

>From my understanding if you want to terminate Long Distance traffic to the LECs exchanges you have to have end office trunking. Being that end office trunks are special access the only affordable way to do this is to be collocated in the exchange or have 3rd party trunking into the exchange. I would like to start looking into this as we are having to collocate in an increasing number of exchanges and I would like to try to recoup some money by terminations if possible. Does anyone else do this or have any advice on the matter? Thanks guys! -Eric

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Terminating LD Traffic
by naushit＠yahoo.com Jan. 9, 2011

Jan. 9, 2011

Eric, You did not mentioned LATA or Area, I assume you are looking for nation wide connectivity? We are New York based CLEC, and we have plenty of extra bandwidth to ILEC End offfice and Tandem office. We would be happy to share bandwidth at cost and collocate your equipment in our data center in most affordable way. We are also interested in trading Chicago DIDs ( or any other area DIDs too) for NYC DIDs . Please contact me off the list. -Naush. From: Eric Hiller <clec at cygnustel.com> To: voiceops at voiceops.org Cc: Sent: Saturday, January 8, 2011 7:25:39 PM Subject: [VoiceOps] Terminating LD Traffic >From my understanding if you want to terminate Long Distance traffic to the LECs exchanges you have to have end office trunking. Being that end office trunks are special access the only affordable way to do this is to be collocated in the exchange or have 3rd party trunking into the exchange. I would like to start looking into this as we are having to collocate in an increasing number of exchanges and I would like to try to recoup some money by terminations if possible. Does anyone else do this or have any advice on the matter? Thanks guys! -Eric _______________________________________________ VoiceOps mailing list VoiceOps at voiceops.org https://puck.nether.net/mailman/listinfo/voiceops

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"Ring Down" Phone
by robert.dawson＠mindshift.com Jan. 7, 2011

Jan. 7, 2011

I am sure I have seen these before but I am not turning anything up . . . basically looking for an endpoint with no keypad that is programmed to dial a specified number when it goes off hook - just like a door box. Anyone know of anything offhand? Thanks, Rob

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Porting numbers from Centurytel
by mylists＠battleop.com Jan. 4, 2011

Jan. 4, 2011

Does anyone know of a SIP provider that can port numbers from Centurylink ILec markets across the country? We run into this often where a customer has remote locations that are in Centurylink territory and we can't port their numbers back to our network. Most of these markets have small Centurylink footprints or they are somewhat rural. Richey

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Polycom Ghost Ringing
by clec＠cygnustel.com Jan. 3, 2011

Jan. 3, 2011

We are having the strangest issue that I have seen for some time. A customer of ours with Polycom phones (4x ip335, 2x ip550) will occasionally (maybe 1 in 50 calls) hear ringing on the line along with the other party. It has happened on both incoming and outgoing calls across apparently all of the phones. We use ip550 in our office and have never had such a problem (we run the same firmware as well, although their hardware is newer). It can be fixed if the person using the phone puts the other person on hold and then takes them off hold. They have just been doing this by double pressing hold so the other party doesn't even realize it. Call setup on these calls is all normal: invite from pbx to phone 100 trying from phone to pbx 180 ringing from phone to pbx 200 ok from phone to pbx ack from pbx to phone <start rtp> I have listened to the RTP and there is absolutely no ringing! At this point I am entirely out of ideas! Does anyone have anything to suggest or has possibly encountered this before? Thanks for any ideas or help! -Eric

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