VoIP QoS/QoE Solutions pros & cons
VoIP QOS is an important consideration for businesses moving to Internet telephony. Voice over Internet Protocol Quality of Service, is a practice that is used in VOIP services to determine the overall performance of a VOIP network. while QOS is used in other systems especially in computer networks, but it is more important in VOIP [...]
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| February 16, 2011 5:14 AM
Edgewater Networks, QoS, VoIP
VoIP QOS is an important consideration for businesses moving to Internet telephony. Voice over Internet Protocol Quality of Service, is a practice that is used in VOIP services to determine the overall performance of a VOIP network. while QOS is used in other systems especially in computer networks, but it is more important in VOIP [...]
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| February 16, 2011 5:14 AM
Edgewater Networks, QoS, VoIP
Cisco IP phone – Can’t receive external calls
Seems like the ephone-dn might be misconfigured.. at least thats the best place to start looking
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| February 15, 2011 5:08 PM
Cisco, Cisco 7961, Cisco IP phone, IP telephony
Seems like the ephone-dn might be misconfigured.. at least thats the best place to start looking
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| February 15, 2011 5:08 PM
Cisco, Cisco 7961, Cisco IP phone, IP telephony
Free IT Book: AAA Identity Management Security
Hi, Just posted my answer to <b>Bandwidth & prerequisites for VMware View</b> <a href=”http://itknowledgeexchange.techtarget.com/itanswers/vmware-view/”>here</a>. An answer to <b>Upgrade Exchange 2007 from 2003 (downgrade license of 2007)</b> posted <a href=”http://itknowledgeexchange.techtarget.com/itanswers/upgrade-exchange-2007-from-2003-downgrade-license-of-2007/”>here</a>.
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| February 15, 2011 4:47 PM
AS/400, Channel, CIO, CRM, Database, DataCenter, Development, Exchange, IT Books, Linux, Lotus Domino, Microsoft Windows, Mobile, Networking, Oracle, SAP, Security, SQL Server, Storage, Virtualization, VoIP, Windows Server
Hi, Just posted my answer to <b>Bandwidth & prerequisites for VMware View</b> <a href=”http://itknowledgeexchange.techtarget.com/itanswers/vmware-view/”>here</a>. An answer to <b>Upgrade Exchange 2007 from 2003 (downgrade license of 2007)</b> posted <a href=”http://itknowledgeexchange.techtarget.com/itanswers/upgrade-exchange-2007-from-2003-downgrade-license-of-2007/”>here</a>.
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| February 15, 2011 4:47 PM
AS/400, Channel, CIO, CRM, Database, DataCenter, Development, Exchange, IT Books, Linux, Lotus Domino, Microsoft Windows, Mobile, Networking, Oracle, SAP, Security, SQL Server, Storage, Virtualization, VoIP, Windows Server
Contest Bounties: Last chance to win an iPad!
tweeted about IT Knowledge Exchange via twitter..
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| February 12, 2011 1:03 AM
AS/400, Channel, CIO, CRM, Database, DataCenter, Development, Exchange, ITKE Contests, Linux, Lotus Domino, Microsoft Windows, Mobile, Networking, Oracle, SAP, Security, SQL Server, Storage, Virtualization, VoIP, Windows Server
tweeted about IT Knowledge Exchange via twitter..
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| February 12, 2011 1:03 AM
AS/400, Channel, CIO, CRM, Database, DataCenter, Development, Exchange, ITKE Contests, Linux, Lotus Domino, Microsoft Windows, Mobile, Networking, Oracle, SAP, Security, SQL Server, Storage, Virtualization, VoIP, Windows Server
Can you help with the differences between DSCP and TOSbit?
Here’s a great page for what you’re asking: <a href=”http://www.cisco.com/en/US/tech/tk543/tk757/technologies_tech_note09186a00800949f2.shtml”>DSCP and QOS</a>
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| February 11, 2011 10:30 PM
DSCP, VLAN, VLAN configuration, VLAN protocols, VoIP
Here’s a great page for what you’re asking: <a href=”http://www.cisco.com/en/US/tech/tk543/tk757/technologies_tech_note09186a00800949f2.shtml”>DSCP and QOS</a>
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| February 11, 2011 10:30 PM
DSCP, VLAN, VLAN configuration, VLAN protocols, VoIP
If we set up QOS without a VLAN is it good enough for VOIP traffic?
Absolutely! The reason you would implement VLAN’s is to segment ARP, DNS and other traffic for different purposes over the same ethernet physical layer. Really, it depends how many devices you have. If you deploy 15 IP phones, have 6-8 simultaneous calls at most, and have another 20 PC’s and a handful of servers, there [...]
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| February 11, 2011 10:18 PM
QoS, VLAN, VLAN configuration, VLAN management, VoIP
Absolutely! The reason you would implement VLAN’s is to segment ARP, DNS and other traffic for different purposes over the same ethernet physical layer. Really, it depends how many devices you have. If you deploy 15 IP phones, have 6-8 simultaneous calls at most, and have another 20 PC’s and a handful of servers, there [...]
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| February 11, 2011 10:18 PM
QoS, VLAN, VLAN configuration, VLAN management, VoIP
Open IT Forum: Security Worst-Cases
We had an IT exec who also wanted to write code, especially SQL. He would take nice compact stored procedures and turn them into a nightmare. Not only did he rewrite 75 % of the stored procedures, he bypassed our content control system doing it so none of it was documented. He had procedures that [...]
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| February 11, 2011 6:18 PM
AS/400, Channel, CIO, Cloud Security, CRM, Database, DataCenter, Development, Exchange, Linux, Lotus Domino, Microsoft Windows, Mobile, Networking, Open IT Forum, Oracle, SAP, Security, SQL Server, Storage, Virtualization, VoIP, Windows Server
We had an IT exec who also wanted to write code, especially SQL. He would take nice compact stored procedures and turn them into a nightmare. Not only did he rewrite 75 % of the stored procedures, he bypassed our content control system doing it so none of it was documented. He had procedures that [...]
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| February 11, 2011 6:18 PM
AS/400, Channel, CIO, Cloud Security, CRM, Database, DataCenter, Development, Exchange, Linux, Lotus Domino, Microsoft Windows, Mobile, Networking, Open IT Forum, Oracle, SAP, Security, SQL Server, Storage, Virtualization, VoIP, Windows Server
For VoIP Server recruitment.
You mentioned it was working in your lab, if i read that right, but when you moved it to a rack, you cannot connect.. Best practice is to work up the OSI model – check the cbaling, then check the configs of the devices its wired through to get from your workstation/Phone to the server [...]
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| February 11, 2011 2:33 PM
HP ProLiant, HP ProLiant servers, HP ProLiant Troubleshooting, VoIP, VoIP services
You mentioned it was working in your lab, if i read that right, but when you moved it to a rack, you cannot connect.. Best practice is to work up the OSI model – check the cbaling, then check the configs of the devices its wired through to get from your workstation/Phone to the server [...]
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| February 11, 2011 2:33 PM
HP ProLiant, HP ProLiant servers, HP ProLiant Troubleshooting, VoIP, VoIP services
VPN Routing
No, they shouldn’t be, unless you define the VPN connection to be created over multiple transports. ——————————— I agree with MrDenny: VPN tunnels are typically from host (IP) to host (IP). So unless the router interfaces are all configured to work on the same VPNs, then NO, the VPN traffic will typically be on the [...]
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| February 9, 2011 9:17 PM
DSL, DSL routers, VPN, VPN routers, VPN routing
No, they shouldn’t be, unless you define the VPN connection to be created over multiple transports. ——————————— I agree with MrDenny: VPN tunnels are typically from host (IP) to host (IP). So unless the router interfaces are all configured to work on the same VPNs, then NO, the VPN traffic will typically be on the [...]
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| February 9, 2011 9:17 PM
DSL, DSL routers, VPN, VPN routers, VPN routing
Call Divert to Mobile for non UCCM User using Cisco Voice Gateway
That sounds like simple call-forwarding. Just creat an ephone and ephone-dn that allows for call-forwarding for the mobile user. Add the DN to a phone, then forward the IP Phone to the users mobile device…
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| February 9, 2011 7:38 PM
Cisco 2811, Cisco 2811 configuration, Cisco Call Manager, Cisco Voice Gateway
That sounds like simple call-forwarding. Just creat an ephone and ephone-dn that allows for call-forwarding for the mobile user. Add the DN to a phone, then forward the IP Phone to the users mobile device…
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| February 9, 2011 7:38 PM
Cisco 2811, Cisco 2811 configuration, Cisco Call Manager, Cisco Voice Gateway
Computer network subnetting
You can use NAT and PAT to have an internet access in those systems, even you can use ISA server or <a href=”http://itknowledgeexchange.techtarget.com/network-technologies/open-source-network-gateway/”>Untangle </a>. You would need, in addition to what else you have provided you have, a PAT supporting firewall. What is PAT? It stands for Port Address Translation. Very similar to NAT, it [...]
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| February 8, 2011 10:07 PM
IP addressing, ISP, Network Configuration, Network management, Network Topology, public IP addresses., Subnetting, TCP/IP
You can use NAT and PAT to have an internet access in those systems, even you can use ISA server or <a href=”http://itknowledgeexchange.techtarget.com/network-technologies/open-source-network-gateway/”>Untangle </a>. You would need, in addition to what else you have provided you have, a PAT supporting firewall. What is PAT? It stands for Port Address Translation. Very similar to NAT, it [...]
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| February 8, 2011 10:07 PM
IP addressing, ISP, Network Configuration, Network management, Network Topology, public IP addresses., Subnetting, TCP/IP
How to configure Cisco 2811
Cisco.com has great links for complex configs: http://www.cisco.com/en/US/docs/ios/12_4t/12_4t4/dsl_hwic.html
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| February 8, 2011 7:50 PM
ADSL, Cisco, Cisco 2811, ISDN, Router configuration, Routers
Cisco.com has great links for complex configs: http://www.cisco.com/en/US/docs/ios/12_4t/12_4t4/dsl_hwic.html
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| February 8, 2011 7:50 PM
ADSL, Cisco, Cisco 2811, ISDN, Router configuration, Routers
Cisco 7965 and remote SIP server not working
First things that come to mind are: 1) For the “external” TFTP/SIP providers, do you have the DHCP option 150 pointing to those IP addresses? I read that you changed remote IP/NAT, but I’m asking if the DHCP server your phone is connecting to is pointing it to the “remote” locations properly… 2) When you [...]
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| February 8, 2011 6:54 PM
Cisco, cisco 7965, Cisco Phones, SIP, TFTP
First things that come to mind are: 1) For the “external” TFTP/SIP providers, do you have the DHCP option 150 pointing to those IP addresses? I read that you changed remote IP/NAT, but I’m asking if the DHCP server your phone is connecting to is pointing it to the “remote” locations properly… 2) When you [...]
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| February 8, 2011 6:54 PM
Cisco, cisco 7965, Cisco Phones, SIP, TFTP
Removing CDP numbers from switches
When you say “Numbers that have been CDP’d into the switch” are you referring to the auto-registration of your phones? If this is the case, going into your telephony-services config and adding “no auto-registration” will prevent the phones from “pre-registering” and allow you to add in the ephones / ephone-dns as you need to. OR, [...]
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| February 7, 2011 3:08 PM
CDP, DSC, Nortel CS 1000, RLI, Switches, Switching
When you say “Numbers that have been CDP’d into the switch” are you referring to the auto-registration of your phones? If this is the case, going into your telephony-services config and adding “no auto-registration” will prevent the phones from “pre-registering” and allow you to add in the ephones / ephone-dns as you need to. OR, [...]
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| February 7, 2011 3:08 PM
CDP, DSC, Nortel CS 1000, RLI, Switches, Switching
Open IT Forum: Tell us your must-read IT blog or Twitter feed & earn 50 knowledge points!
<a href=”http://itknowledgeexchange.techtarget.com/sql-server/”>Mr. Denny</a> <a href=”http://blogs.technet.com/b/virtualization/”>MS Hyper-V Team blog</a>
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| February 3, 2011 5:10 PM
AS/400, Channel, CIO, CRM, Database, DataCenter, Development, Exchange, ITKE, ITKE Contests, Linux, Lotus Domino, Microsoft Windows, Mobile, Networking, Open IT Forum, Oracle, SAP, Security, SQL Server, Storage, Virtualization, VoIP, Windows Server
<a href=”http://itknowledgeexchange.techtarget.com/sql-server/”>Mr. Denny</a> <a href=”http://blogs.technet.com/b/virtualization/”>MS Hyper-V Team blog</a>
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| February 3, 2011 5:10 PM
AS/400, Channel, CIO, CRM, Database, DataCenter, Development, Exchange, ITKE, ITKE Contests, Linux, Lotus Domino, Microsoft Windows, Mobile, Networking, Open IT Forum, Oracle, SAP, Security, SQL Server, Storage, Virtualization, VoIP, Windows Server
Earn 50 knowledge points by tweeting out our iPad contest!
Thanks so far to members who’ve already shared the news on Twitter! I’ve added points to: <ul> <li>Saturno</li><li>Shillu13</li><li>BruceWayne</li><li>Slack400</li><li>Batye</li><li>AndreaF</li> </ul> You have until February 16th to qualify for the drawing! If you post a link to someone else retweeting your tweet about the contest, I’ll throw in 50 more points! Thanks! Melanie
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| February 3, 2011 3:53 PM
AS/400, Channel, CIO, CRM, Database, DataCenter, Development, Exchange, ITKE, ITKE Contests, Linux, Lotus Domino, Microsoft Windows, Mobile, Networking, Oracle, SAP, Security, SQL Server, Storage, twitter, Virtualization, VoIP, Windows Server
Thanks so far to members who’ve already shared the news on Twitter! I’ve added points to: <ul> <li>Saturno</li><li>Shillu13</li><li>BruceWayne</li><li>Slack400</li><li>Batye</li><li>AndreaF</li> </ul> You have until February 16th to qualify for the drawing! If you post a link to someone else retweeting your tweet about the contest, I’ll throw in 50 more points! Thanks! Melanie
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| February 3, 2011 3:53 PM
AS/400, Channel, CIO, CRM, Database, DataCenter, Development, Exchange, ITKE, ITKE Contests, Linux, Lotus Domino, Microsoft Windows, Mobile, Networking, Oracle, SAP, Security, SQL Server, Storage, twitter, Virtualization, VoIP, Windows Server
Free IT Book: Computer Incident Response and Product Security
Just answered <b>OWA connection problem with Exchange 2010</b> <a href=”http://itknowledgeexchange.techtarget.com/itanswers/exchange-server-8/”>here</a>. Another answer to <b>Cisco Catalyst and Juniper VLANs</b> <a href=”http://itknowledgeexchange.techtarget.com/itanswers/cisco-catalyst-and-juniper-vlans/”>here</a>. A tip to the question <b>Exchange 2003 IMAP Configured for VPN Only</b> <a href=”http://itknowledgeexchange.techtarget.com/itanswers/exchange-2003-imap-configured-for-vpn-only/”>here</a>. Another tip <b>OCS and AutoLogon BSOD Issues</b> <a href=”http://itknowledgeexchange.techtarget.com/itanswers/ocs-and-autologon-bsod-issues/”>here</a> About <b>Mitigating cloud server risks during DDoS attacks</b> , I <a href=”http://itknowledgeexchange.techtarget.com/itanswers/mitigating-cloud-server-risks-during-ddos-attacks/”>pointed [...]
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| January 31, 2011 10:19 PM
AS/400, Channel, CIO, CRM, Database, DataCenter, Development, Exchange, Giveaways, ITKE Contests, Linux, Lotus Domino, Microsoft Windows, Mobile, Networking, Oracle, SAP, Security, SQL Server, Storage, Virtualization, VoIP, Windows Server
Just answered <b>OWA connection problem with Exchange 2010</b> <a href=”http://itknowledgeexchange.techtarget.com/itanswers/exchange-server-8/”>here</a>. Another answer to <b>Cisco Catalyst and Juniper VLANs</b> <a href=”http://itknowledgeexchange.techtarget.com/itanswers/cisco-catalyst-and-juniper-vlans/”>here</a>. A tip to the question <b>Exchange 2003 IMAP Configured for VPN Only</b> <a href=”http://itknowledgeexchange.techtarget.com/itanswers/exchange-2003-imap-configured-for-vpn-only/”>here</a>. Another tip <b>OCS and AutoLogon BSOD Issues</b> <a href=”http://itknowledgeexchange.techtarget.com/itanswers/ocs-and-autologon-bsod-issues/”>here</a> About <b>Mitigating cloud server risks during DDoS attacks</b> , I <a href=”http://itknowledgeexchange.techtarget.com/itanswers/mitigating-cloud-server-risks-during-ddos-attacks/”>pointed [...]
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| January 31, 2011 10:19 PM
AS/400, Channel, CIO, CRM, Database, DataCenter, Development, Exchange, Giveaways, ITKE Contests, Linux, Lotus Domino, Microsoft Windows, Mobile, Networking, Oracle, SAP, Security, SQL Server, Storage, Virtualization, VoIP, Windows Server
Fill out your profile and add a picture to win an iPad
Profile updated! Free iPad me please
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| January 31, 2011 8:39 PM
Application security, Backup storage, Channel, CIO, CRM, Data management, DataCenter, Development, Exchange, ITKE, ITKE Community, ITKE Contests, Microsoft Windows, SQL Server, VoIP
Profile updated! Free iPad me please
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| January 31, 2011 8:39 PM
Application security, Backup storage, Channel, CIO, CRM, Data management, DataCenter, Development, Exchange, ITKE, ITKE Community, ITKE Contests, Microsoft Windows, SQL Server, VoIP
Securing SIP signaling without deteriorating VoIP traffic
SIP traffic can be secured at the transport layer by encrypting data using TLS over TCP. However, using TLS as a transport by itself only guarantees encryption over a single hop. Since it is very common for a SIP call to traverse multiple proxy servers from one end to the other, there is a need [...]
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| January 31, 2011 8:31 PM
Security, Security management, SIP Attacks, SIP Vulnerabilities, VoIP
SIP traffic can be secured at the transport layer by encrypting data using TLS over TCP. However, using TLS as a transport by itself only guarantees encryption over a single hop. Since it is very common for a SIP call to traverse multiple proxy servers from one end to the other, there is a need [...]
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| January 31, 2011 8:31 PM
Security, Security management, SIP Attacks, SIP Vulnerabilities, VoIP
Voice and Data Network Setup
Good Evening, Use 3CX (PDX) on any windows for Voice, and have that run on any gateway. Plug your Data (PC’s) on a different switch, have that multiplex on the same router or the a different gateway for Load Balancing, But always configure your router to perferbly use Qos on the Voice.
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| November 9, 2012 2:20 AM
Cisco, Cisco Phones, ISP, VOIP setup
Good Evening, Use 3CX (PDX) on any windows for Voice, and have that run on any gateway. Plug your Data (PC’s) on a different switch, have that multiplex on the same router or the a different gateway for Load Balancing, But always configure your router to perferbly use Qos on the Voice.
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| November 9, 2012 2:20 AM
Cisco, Cisco Phones, ISP, VOIP setup
