Questions tagged [voip]

For questions about Voice over Internet Protocol (VoIP) which encompasses various technologies (methods, functions, and encapsulations) for encoding and delivering audio on a network using IP.

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MOS in RTCP packets (VoIP) [closed]

I want to find out how the MOS value is calculated in RTCP packets. different places give different details, like it is just a sum, where you start with an R value and using a formula, factor in ...
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1answer
53 views

Using DTMF signals of a VoIP gateway when interacting with an analog ministation (PBX)

There is such a configuration: Internet ===> [WAN port] Grandstream HT812 with hosted PBX users [FXS ports] ===> analog ministation Panasonic ===> analog telephone sets Situation: When a caller ...
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2answers
49 views

How does UDP provide continuous sound in VOIP even though segments are discrete?

I would like to know how does UDP achieve continuity in VOIP or in any streaming service.
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12 views

Cisco 7960 CTL File Encoding

When booting my 7960 phone, I am getting all of the correct files. However, in trust list (CTL File), the IP addresses are incorrect. They are the ASCII characters of the actual IP address. Therefore, ...
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2answers
161 views

Why does yealink ip phone is not getting ip address from voice vlan?

I have configured separate vlan for voip and connected interface to it (as shown below). But the phone is not getting ip address automatically. switch- cisco 2960-x phone- yealink I had tried: (on ...
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19 views

Yealink T22p Quality Issue

We have around 7 Yealink T22p. Phone quality is good when only one phone is being used. If there are more than two phones are being used at the same time, one of them breaks up a lot but it breaks ...
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1answer
46 views

VoIP, IPsec configuration

I have a topology in GNS3 with an IPsec VPN tunnel between C1 and C2 (https://imgur.com/dnNkssU). In clients networks i am configured a CME and a Softphone. When i make a call the quality is very bad. ...
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1answer
51 views

qos inside vpn, possible or not ? I read yes and no

I am wondering if possible to do QOS (or similar action) inside vpn tunnel to a cloud server. the goal is to reserved bandwith for voip traffic. I read that you can with GRE and other people said, ...
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1answer
154 views

VLAN VoIP and LAN configuration over multiple switches

Some background: I currently have: Switch A Main 48 port 1Gbps (DLink) Switch B 10Gbps Backbackbone (DLink) Switch C 24 port 1Gbps (DLink) Telephone Switch 1-24 port phone switch connected to a ...
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1answer
325 views

HP V1910 ProCurve Voice VLAN auto mode possible with LLDP and no OUI mask?

On a ProCurve V1910 I have configured Voice VLAN as follows in network settings using the Web UI: LLDP -> Global Setup -> LLDP Enable -> Set Enable VLAN -> Modify Port -> Select ports -> Set Link ...
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1answer
41 views

Landline phone on VOIP network without an adapter

Today someone asked me if he can make calls using a regular landline phone connected to a VOIP network without using a VOIP adapter, just by using an Ethernet to Telephone line adapter, at his work he ...
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1answer
39 views

ISP Failover On A Converged Network

We have our fiber providor as our primary ISP. We have comcast as our secondary ISP and our Voip providor. We can setup the failover between the two ISPs. We also have 19 voip phones that are on a ...
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43 views

TCL Tool Command Language tclsh - Script for Cisco SPA508G Phone Sidecar Auto-attendant

Using Cisco SPA508G phones with SPA500S Sidecar Console. In the Cisco UI Sidecar programming is the script: fnc=blf+sd+cp;sub=108@$PROXY;nme=Steve J. I need both sub=108@$PROXY and sub=408@$PROXY ...
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0answers
137 views

Changing DSCP values in a Cisco Switch [closed]

We have an endpoint which cannot tag outgoing RTP packets as 46 (EF).... Currently they happily churn out as 0 Can the Cisco switch it is entering, recognise it's RTP traffic and then change the ...
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1answer
93 views

Replacing IP address of connections from AWS towards SIP

We have installed a PBX on AWS and connected it to our on-prem Router via VPN. My on-prem router is connected to the SIP provider via a physical connection with another on-prem MUX device (device ...
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1answer
207 views

Is an SBC sufficient and can it NAT

We have a gateway which faces out to our VoIP SP. As we get more users we need some security in front of it. Currently our gateway terminates directly to the SP. We would like to put a SBC in front ...
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2answers
55 views

Advice on potentially needed subnet expansions

I work for a non-profit with some slightly more antiquated hardware. We have 3 locations, about 700 devices across them. Right now our locations are set up as: Location 1 (Main) - /23 with a DHCP ...
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0answers
215 views

Cisco phone display name change

I am trying to change name on cisco ip phone 7942. I changed the name in directory number configuration and in phone configuration of phone on CUCM. I did reset of phone too. But still showing the old ...
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0answers
50 views

QOS - the need for it and verifying it

Just some straightforward questions, hope gurus here can shed some light 1) show int - output queue -> this is the hardware queue (tx-ring) or this is the software queue ? if I see drop, this means ...
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1answer
96 views

Cisco Unity Connection guest, ESXi host, IP phones, vlan, subnet, ip addresses, qos

I have setup: VLAN 1 and subnet 192.168.1.0/24 for data VLAN 100 and subnet 192.168.100.0/24 for voice IP phones get their IP via DHCP on the subnet 192.168.100.0/24 all other IP devices get their IP ...
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1answer
43 views

Cisco 3750 - configure to mimic multi location scenario

Good morning. For starters, I am less than a noob with cisco products. I can access, so basic trunking for our nec phone systems, etc. I have a 3750 that I'd like to configure to mimic a multi ...
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3answers
2k views

Is QoS an issue for VOIP calls over the Internet? If not, why not?

I'm trying to decide whether I should buy SIP trunks from my ISP or a 3rd-party. As I understand it, it's important to maintain QoS on an internal network (i.e. prioritize VOIP traffic). Is this not ...
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1answer
205 views

VOIP timeout behind Cisco ASA after Duplicate ACK and Retransmissions

We have a RingCentral Polycom VVX series VOIP phone behind a Cisco ASA 5506 that will provision, work for about five minutes, go off-line for 20 minutes then reconnect and continue to work unless ...
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1answer
211 views

What Is Session Border Controller [closed]

What is Session Border Controller(SBC). And What is the Advantages of SBC. How Does It Works?
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3answers
288 views

Cisco Vlan block access

So I have 2 core switches and 1 access switch, I have the vlans 1, 10, 20, 30 and 100. Vlan 10 is voip and what I would like to do is stop anyone on the other vlans from being able to see that subnet, ...
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1answer
2k views

1-1 NAT on a SonicWall with a DMZ

A new PBX is being installed at one of our clients today, and they have requested that we give them one of our unused public IP addresses(Comcast is the ISP, have a block of IPs) for use with the PBX. ...
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0answers
58 views

Configure C1861 for SIP to FXS port

I found a C1861 ISR router and I would like to play with it a learn some telephony. I signed up for a VOIP service so I have SIP credentials. Is there a simple walkthrough anywhere to set up the SIP ...
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1answer
742 views

Fortigate 90D SD-WAN: VPN and VoIP

i am contemplating the idea of switching our current FG 80D to a 90D and implement SD-WAN using our current 100Mbit fiber circuit (main) and the 4G LTE (cradlepoint) for internet backup. Our current ...
2
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1answer
1k views

Problems Adding IPPhone to VLAN in Packet Tracer

I am trying to add two IPPHONES in a VLAN and it does not seem to be working as the phones are not receiving their ip addresses. I have a router going through a switch and the phones are then ...
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1answer
466 views

Phone and PC network sharing one wifi bridge

We have a Cisco router from our T-mobile provider, two subnets on two ethernet ports: one subnet for PC data network, one subnet for IP phone network. The subnets have different IP addressing. As per ...
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2answers
479 views

VLAN Tags Being Different for a VoIP Phone vs. the Host Daisy-Chained to it?

I've recently began working for a VoIP Provider and I am constantly seeing VoIP Phones pulling different VLANs than the Host that is connected to it i.e. daisy-chained. When I've tried to look more ...
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1answer
68 views

Is there a point to have VLANs if each PC client can access them all?

At work we have a config where VLAN 1 is the main network and VLAN 2 is the phone system. The workstations connect automatically to VLAN 1 but can also access the control panels of each phone through ...
3
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1answer
745 views

EX3300: Voice VLAN stopped working after upgrade to 15.1R6.7

We have 50+ Juniper EX3300 switches with access points configured to work with dot1x and voice vlan. We also have a variety of Yealink T23G, T42G, T26G and T48G phones that worked perfectly in our ...
5
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1answer
5k views

Do i need to configure VLANS on my router/firewall or just the switch?

I finally took time to map my entire shitty network to understand exactly what the guy before me did, and i must admit i'm a little bit surprised even if i'm not a network expert... Just take a look ...
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1answer
436 views

Cisco 7960 SIP phone background image issues

I have an asterisk home PBX and I recently got a Cisco 7960G on eBay. So far I got everything working but the background images are quite tricky. I followed one short how-to and I was able to actually ...
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1answer
269 views

QoS implementation for VoIP network

We are in VoIP business and running RTP/SIP traffic 80% in our network we have other servers also like www and monitoring and operation, our network is very flat and simple also we have very basic ...
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1answer
198 views

Configure switch in GNS3

Is there any way to configure a switch in GNS3?
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4answers
819 views

Can I run two separate internet connections over one Cat5e cable

I have two ISP's coming into the building. One is a T1 that is going to be used for VOIP phones. The second is high speed internet connection going to be used for internet. Each office has one cat5e ...
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1answer
827 views

Bandwidth regulation without QoS and VLAN [closed]

Does anyone know any possibility to do Bandwidth reservation or something equal to it. Mainly to give VoIP and IPTV Bandwidth before the Internet when there is no possibility to use QoS and VLAN. It ...
3
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1answer
3k views

Cisco ASA SIP/RTP inspection question

I have following scenario: [VoIP phone]--------[ASA 5550]----------[SIP Server] VoIP phone: 10.0.0.10 SIP server: Public Address Question: In above scenario do i need to specify or open RTP ...
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2answers
233 views

VoIP only for two phones

I would like to connect only two IP phones to talk each other (I have no idea about IP telephony). Is it possible without using a PBX? I mean, just connecting IP phone to IP phone with a straight/...
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1answer
249 views

Does UDP work for Load Balancing?

while I was working today on router, My senior said that since VoIP protocol works on UDP, it doesn't support load balancing, which I couldn't quite understand. Can someone enlighten me on this. We ...
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2answers
107 views

Mostly wireless campus vs. VoIP

We will be replacing our campus network in the next year or two, and we are leaning towards increasing the use of wireless since most people primarily work from laptops & mobile devices. Plus, we ...
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1answer
382 views

VoIP on a remote VPN site

I have a remote site that needs both data and voice. We have a VPN L2L tunnel up and running back to the hospital, no problem. The concern is that I have data and voice on the same VLAN, and it is ...
3
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1answer
479 views

Call is disconnected after huntstopped to another phone

We've been having an issue at the office with our Cisco CME. Here's the situation. Phone A (outside line) dials into the main line and after ~three rings the call is huntstopped to four other phones. ...
2
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2answers
347 views

How do I diagnose a VoIP issue on a Cisco 2811?

Background Our shop consists of approximately 10~12 Cisco IP phones which then connect to their respective workstations. Each phone is connected to the only switch in the shop which is a Cisco 2950 ...
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1answer
50 views

Smart switching calls in a company phone calls

We use VoIP phones in our company. Some people calls and each one connected to first free operator, and each people calls us once a week, we need one more option to make better experience for our ...
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1answer
56 views

VoIP Provider and Phone Number Routing Questions

I am fairly familiar with VoIP and I have my own VoIP PBX, and my provider is Twilio (for Voice) and CallCentric (for Fax). But How do providers like Twilio work exactly? More specifically: How do ...
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1answer
293 views

ESI PBX LAN-only VoIP phone forwarding thru IPSec tunnel - remote router sees packets but not phone, doesn't forward

Okay, so we have an older X-Class ESI PBX system, an ESI IVX 128x FSIII [see below for link]. We have an LNC card installed in it, which allows for the use of up to 12 LAN-only VoIP phones. We have an ...
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1answer
336 views

Is it possible for ISPs to block part of VPN traffic, like UDP traffic only [closed]

My Question isn't about any carrier or ISP, as it might sound. It's about the technical aspect of internet censorship and needs networking experts to help. As you may know, some countries are blocking ...