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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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Designing a web-facing network for redundancy and QoS (in a small business)

Summary How does one configure the web-facing part of a small business network for redundancy and quality of service? I mean ... we can have the control over our internal infrastructure, but what ...
iDontKnow's user avatar
1 vote
2 answers
77 views

VoIP SIP PCAP issue

I have a question for anyone who might know the answer. My boss has asked me to PCAP a SIP stream from a VOIP phone by plugging my laptop into the same unmanaged switch, without enabling port ...
Dylan Gray's user avatar
1 vote
0 answers
25 views

How to reroute a dial pattern to another phone number? [closed]

In Asterisk/FreePBX you can add an outbound route with normal trunking and set a dial pattern like so, in order to reroute any call from 00316 to 08445930044 (a cheap public access number from GB > ...
Danny Beckett's user avatar
0 votes
1 answer
71 views

Are SIP numbers provided by the SIP Trunk provider?

Background I'm trying to understand how SIP works and the industry in general. We are planning to setup a PBX (open source) and have SIP phones for our customer care agents. When I was researching on ...
Eben Paul's user avatar
1 vote
2 answers
61 views

Is it possible to have sequential ring call-forwarding and internet voice-mail in plain old-telephone system instead of VOIP?

Is it possible to have sequential ring call-forwarding on a plain old-telephone system (non Voice over Internet Protocol VOIP)? Though non-VOIPs might not exist in America, can I have all my features ...
Coo's user avatar
  • 113
0 votes
0 answers
114 views

Configure VOIP in Packet Tracer 7 in hierarchical network 3-2-1

Hi, I have this tipology, and I want configure the VOIP of host 192.168.0.6 So, first. This network has VTP and two vlans: vlan 10 HOSTS vlan 150 VOIP in the switches the uplink is mode trunk ...
cleanet's user avatar
0 votes
1 answer
2k views

How to set up VoIP inside local network without a VoIP server?

I have a task to set up VoIP inside a small network (~20 Cisco IP Phone 303). Only for calls inside the local network. I have no previous experience with VoIP and I want to do everything in the most ...
spektro37's user avatar
0 votes
1 answer
504 views

Firmware of Cisco Phone

i want to configure IP phone Cisco DX650 with Sip.Anyone have idea about it how i can upload firmware of sip feature
waleed's user avatar
  • 53
5 votes
1 answer
390 views

Is TCP slow start supposed to be enabled for VoIP SIP?

TCP slow start mechanism generally is pretty useful in most cases. But it is not so good and reasonable for short-lived TCP connections. Hence the question: Should TCP slow start be used with SIP-over-...
z0lupka's user avatar
  • 207
5 votes
2 answers
6k views

Whats the difference between VOICE VLAN and ACCESS VLAN

Can someone please tell me the difference in Layman's termsfor these 2 configurations? interface FastEthernet0/1 description PHONES switchport mode access **switchport voice vlan 51** spanning-...
Vojta Ripa's user avatar
0 votes
1 answer
2k 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 ...
Snowjay's user avatar
0 votes
2 answers
83 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.
A NASR's user avatar
  • 3
0 votes
2 answers
8k 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 ...
nirali's user avatar
  • 1
1 vote
1 answer
153 views

VoIP, IPsec configuration

I have a topology in GNS3 with an IPsec VPN tunnel between C1 and C2 (https://i.sstatic.net/Vd2BA.jpg). In clients networks i am configured a CME and a Softphone. When i make a call the quality is ...
Lucian's user avatar
  • 29
0 votes
1 answer
1k 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, ...
svi08wi0er92u30r's user avatar
3 votes
1 answer
737 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 ...
Pete Matthews's user avatar
0 votes
1 answer
1k 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 ...
Jasper's user avatar
  • 101
1 vote
1 answer
156 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 ...
HMZ's user avatar
  • 165
1 vote
1 answer
73 views

ISP Failover On A Converged Network

We have our fiber provider as our primary ISP. We have Comcast as our secondary ISP and our VoIP provider. We can setup the failover between the two ISPs. We also have 19 VoIP phones that are on a ...
null's user avatar
  • 11
1 vote
0 answers
69 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 ...
Steve J's user avatar
  • 11
1 vote
0 answers
268 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 ...
user10021657's user avatar
1 vote
1 answer
154 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 ...
vichar's user avatar
  • 11
1 vote
1 answer
471 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 ...
user10021657's user avatar
2 votes
2 answers
82 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 ...
ct253704's user avatar
3 votes
1 answer
1k 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 ...
Amn Mhl's user avatar
  • 31
1 vote
0 answers
54 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 ...
Noob's user avatar
  • 529
2 votes
1 answer
123 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 ...
Léa Massiot's user avatar
1 vote
2 answers
94 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 ...
TERRY's user avatar
  • 11
10 votes
3 answers
3k 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 ...
Travis's user avatar
  • 203
3 votes
1 answer
386 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 ...
opus's user avatar
  • 33
4 votes
1 answer
291 views

What Is Session Border Controller [closed]

What is Session Border Controller(SBC). And What is the Advantages of SBC. How Does It Works?
Sundar's user avatar
  • 41
2 votes
4 answers
445 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, ...
AvidPontoon's user avatar
1 vote
1 answer
3k 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. ...
Jonah Matthews's user avatar
3 votes
0 answers
90 views

Configure C1861 for SIP to FXS port [closed]

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 ...
ChuckFinley's user avatar
1 vote
1 answer
963 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 ...
David T.'s user avatar
2 votes
1 answer
3k 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 ...
GreenCoder's user avatar
1 vote
1 answer
973 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 ...
Vojtěch Dohnal's user avatar
4 votes
2 answers
995 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 ...
Josh Rowley's user avatar
1 vote
1 answer
446 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 ...
aardbol's user avatar
  • 259
3 votes
1 answer
2k 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 ...
Michał Sacharewicz's user avatar
6 votes
2 answers
12k 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 ...
Thierry Dalleau's user avatar
1 vote
1 answer
773 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 ...
sDoky's user avatar
  • 151
1 vote
1 answer
395 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 ...
Satish's user avatar
  • 4,379
1 vote
1 answer
299 views

Configure switch in GNS3

Is there any way to configure a switch in GNS3?
Nina's user avatar
  • 430
1 vote
4 answers
2k 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 ...
David Riddle's user avatar
0 votes
1 answer
1k 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 ...
konqui's user avatar
  • 103
3 votes
1 answer
5k 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 ...
Satish's user avatar
  • 4,379
2 votes
2 answers
3k 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/...
Jorge_S7's user avatar
1 vote
1 answer
264 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 ...
user3790666's user avatar
1 vote
2 answers
125 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 ...
RSS's user avatar
  • 210