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Questions tagged [sip]

The Session Initiation Protocol (SIP) is an IETF-defined signaling protocol widely used for controlling communication sessions such as voice and video calls over Internet Protocol (IP). The protocol can be used for creating, modifying and terminating two-party (unicast) or multiparty (multicast) sessions. Sessions may consist of one or several media streams.

The Session Initiation Protocol (SIP) is an IETF-defined signaling protocol widely used for controlling communication sessions such as voice and video calls over Internet Protocol (IP). The protocol can be used for creating, modifying and terminating two-party (unicast) or multiparty (multicast) sessions. Sessions may consist of one or several media streams.

The SIP protocol is an Application Layer protocol designed to be independent of the underlying Transport Layer; it can run on Transmission Control Protocol (TCP), User Datagram Protocol (UDP), or Stream Control Transmission Protocol (SCTP).It is a text-based protocol, incorporating many elements of the Hypertext Transfer Protocol (HTTP) and the Simple Mail Transfer Protocol (SMTP).

Source: wikipedia

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Yealink T48S upgrade/downgrade issues

So I’ve been using the T48S on the Skype for Business firmware for a while now (I purchased it second hand on eBay and it came with version 66.9.0.45) I originally flashed it to 66.81.0.70 lync version when I got it so I could mess with a SIP…
XBF
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Asterisk: Using Queue() in the h extension

I'm trying to get users to be able to record a message, hangup and have the call continue and dial Queues and playback the recording. I've gotten most of the way there, but right now when I call Queue() in the h extension it hangs up immediately…
Mattisdada
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For SIP trunks, is it possible that DTMF talk-off could mute a call?

My company sells/supports Allworx SIP PBXs. We have a weird edge case with one of our customers who use PRI for dial-tone. On outbound calls, if a user happens to receive an SMS on their iPhone, and the iPhone is set to play the default "note" tone,…
pooter03
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VoIP over VPN (FritzBox) – can register, can call, but no sound

We have a small company network here (192.168.178.x) and a private network in home office (192.168.2.x). These networks are both running a FritzBox router and are connected via VPN trough FritzBox to FritzBox (IPSec, 192.168.2.1 resolves to…
Kevin Lieser
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Asterisk WebRTC outgoing call delay

I run an Asterisk 16 installation and a WebPhone based on SIP.js. Unfortunately, I often don't hear the first few seconds when I call someone. But everything is fine with incoming calls. The Asterisk is in a data center, the browser / client is…
Hativ
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VOIP phone working intermittently

I'm having problems with my Polycom VVX400 phones. It's the first time i've configured them to work with Aircall.io, our SIP provider. I have them registered just fine and I can make calls, but when I dial it, it rings and works once (I can hear and…
Samuurai
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Why does scp congest my network?

I observe a weird behaviour when I copy files to a remote machine using scp. Take for example this scp command with no special options: scp my.phar remote:apps/ Copying works flawlessly, however my co-workers on the same local network experience…
pleasedisturb
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HP 4120 phone and Asterisk

I got a task to set up a cheap PBX for HP 4120 phones. I want to try Asterisk, but I can't find any info on connecting HP 4120 to any SIP PBX. So here's the question: are HP 4120 compatible with Asterisk? If yes, is there any info on setting up…
real_sm
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Can I use Kamailio Sip Server to handle 500 calling?

I need a Sip server to build a VIOP server to establish voice call between 500 Android an desktop sip clients. Can Kamailio handle this or I need an Asterisk server too?
user2085899
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What type of switch should I get to implement a site with around 140 desktop machines, plus around 20 SIP phones?

We're moving to a new office and we will be needing to setup a network closet. I'm estimating that we will have around 140 ethernet ports and will be using CAT6a cabling for 1Gbps connections. I'm wondering if there is a recommended switch that we…
dukz
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What is the vendor-neutral term for internet telephone service?

Plug in phone to wall with ethernet cable Someone calls a phone number Your phone rings What is the correct, vendor-neutral term for this service? Unfortunately different vendors call this same service many different things. I would like to know…
William Entriken
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