Fault: During the setup of some calls (approx. 1 in 600) a SIP invite is sent from the customer towards the SBC and eventually towards the PGW. The PGW after the expected messages responds with a SIP OK towards the SBC with SDP containing the info for the remote media endpoint (in this case a [...]
Answer Question | February 24, 2012 2:59 PM
RTP, SIP, VoIP
We have installed a voip system from Interactive Intelligence (Indianapolis Oh). We get dial tone from two sip trunks for inbound and outbound calls. Works great. Between sip router, and server, is a firewall. Firewall does not play nice with t38 faxing. Anyone have a similar setup that is working for t38 fax? NOTE: scary…but fax [...]
Answer Question | March 31, 2012 3:13 PM
Firewalls, Interactive Intelligence, SIP, SIP Trunks, VoIP
What role does the SIP proxy server play and what issues would we see if it goes down? Can we run it as a virtual machine and have a backup one in another VM?
Answer Question | May 26, 2011 7:45 PM
Backup Server, Proxy Server Configuration, Proxy servers, SIP, Virtual Machines
We have a data center hosting our sip servers and proxies. The location is far from our main office. How can we monitor the servers and the lines?
Answer Question | May 16, 2012 2:41 PM
Network monitoring, Network Monitoring Tools, Networking, Proxy servers, Server monitoring, SIP
What hardware resources does a carrier need to deploy SIP Trunking Services to current TDM users?
Answer Question | June 29, 2011 6:46 PM
SIP, SIP trunking, Trunking, VoIP
Can we block wireshark or ethereal from being able to run on our Windows 2003 Active Directory network? We want to block sniffers from catching sip/VoIP traffic.
Answer Question | April 15, 2011 7:11 PM
Active Directory 2003, Active Directory security, Ethereal, SIP, VoIP, Windows Server 2003, Windows Server 2003 security, Wireshark
Hey guys, I have this very weird problem and I just can’t fix it.. any ideas would be very appreciated! I have a Cisco 7965 ip phone here on my desk. I have a tftp + sip server running in a datacenter and it seems the phone fetches all the data from the tftp, but [...]
Answer Question | March 28, 2012 1:10 AM
Cisco, cisco 7965, Cisco Phones, SIP, TFTP
What is the technology that would allow a call from a cell phone to be routed to a transmission device that triggers a loud beeping sound. For example, using a cell phone to call a number that calls a database, and then triggers an external receiver that is attached to one’s keychain for example?
Answer Question | March 25, 2011 5:36 AM
Cellular, Cellular networks, Database, Routing, Routing and Remote Access, SIP
How can we determine how many sip proxy servers are needed for a new installation? Is there a tool for this?
Answer Question | February 11, 2011 10:06 PM
Proxy Server Configuration, Proxy servers, Server installation, SIP
when i make a phonecall between 2 softphone via Asterisk server. so asterisk server as a registrar server or location server or UA like B2BUA? i don’t know about it. please help me.thanks
Answer Question | August 25, 2010 2:25 AM
Asterisk, Cisco Softphones, SIP, Ubuntu, Ubuntu 10.04, VoIP
Why od we need SIP trunks. VoIP calls can be made over Networks without it. What is the advantage of SIP Trunks
Answer Question | October 30, 2010 1:31 AM
SIP, SIP trunking, SIP Trunks, VoIP, VoIP Configuration
I am trying to commission a network of Cisco Call Manager Express systems with (mainly) Cisco 521 phones connected to a private IP network for a corporate client. Prior to the “proper” solution being introduced a temporary solution using Asterisk with Grandstream GX-2000 phones was installed to provide limited service. Both solutions are using SIP [...]
Answer Question | February 14, 2011 11:52 AM
CME, SIP, Voice clarity, VoIP, VoIP hardware, VoIP vendors
we are in a Microsoft OCS SIP and VOIP environment. we are having a couple of issues with our unit. #1- out bound calls to the PSTN will auto disconnect after approx. 60 seconds. calls to OCS or VOIP phone numbers have no problems. #2- Inbound calls do not ring the analog phone; however, outbound caller [...]
Answer Question | September 24, 2009 2:43 PM
Microsoft OCS, SIP, VoIP
I have a switchvox AA350 SMB server in my organization which I run. Recently I aquired analog lines for external calls. I put two of the lines into the switchvox (the server came with a four port anolg card)I configured the lines and I was able to make calls through my SIP phones.Yesterday I came [...]
Answer Question | July 6, 2009 7:34 AM
IP phones, SIP, Switchvox AA350, Switchvox SMB 4.0, Unified Communications
hi. I SIP implemented in Peer to Peer under I wanted to use windows(visual C++).Under its Linux site in the existing www.p2psip.org but i need something like that but under use windows.please you guide me to hurry. by.
Answer Question | April 28, 2009 4:17 AM
C++, P2P, SIP, VoIP, Windows P2P
I want to test SIP vulnerabilities using Sipp Message generating tool. i have XML files for generating messages. I have sipp running. But i am not able to execute below command. Run sipp with embedded server (uas) scenario: # ./sipp -sn uas Can i get any help. Thank you Regards Sindhu
Answer Question | May 13, 2009 3:53 AM
Network security, SIP, SIP Attacks
I want to prove SIP vulnerabilities using SiVuS (The VoIp vulnerability scanner ) tool. The test Bed contains Asterisk server and two xlite clients. When Two xlite clients are registered with server. I am able to Remove their registrations from server by generating REGISTER SIP messages using SiVuS from another computer by keeping expiration time [...]
Answer Question | May 13, 2009 3:43 AM
SIP, SIP Vulnerabilities, Sivus, VoIP
How do I configure a port on an AudioCodes sip device to handle a analog modem?
Answer Question | March 25, 2009 5:16 PM
Analog Modems, AudioCodes, Modems, SIP
dear All, I’m all new to VoIP and telephony in general and don’t know the correct terminology…probably someone else already posted my questions in another thread but I managed to confuse the search engine with my query terms. Anyways… Basically I have a PSTN telephone line on which an ADSL modem is connected for internet. [...]
Answer Question | February 19, 2010 9:56 PM
Cell phones, PSTN, SIP, VoIP
We have one site having Cisco UC520 for IP telephony and another site we have nortel PBX. So is it possible to integrate both ? if yes then how and which features will work and which will not work ?? It would be great if someone help me out for the same.
Answer Question | March 2, 2009 6:36 AM
Cisco UC520, IP telephony, Nortel PBX, SIP, Unified Communications