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.
116
questions
1
vote
0
answers
23
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 > ...
- 111
0
votes
1
answer
55
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 ...
1
vote
2
answers
49
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 ...
- 113
0
votes
0
answers
85
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 ...
- 1
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 ...
0
votes
1
answer
443
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
- 53
5
votes
1
answer
387
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-...
- 207
5
votes
2
answers
5k
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-...
- 53
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 ...
- 1
0
votes
2
answers
78
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.
- 3
0
votes
2
answers
7k
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 ...
- 1
1
vote
1
answer
149
views
VoIP, IPsec configuration
I have a topology in GNS3 with an IPsec VPN tunnel between C1 and C2 (https://i.stack.imgur.com/Vd2BA.jpg). In clients networks i am configured a CME and a Softphone. When i make a call the quality is ...
- 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, ...
3
votes
1
answer
691
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 ...
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 ...
- 101
1
vote
1
answer
136
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 ...
- 145
1
vote
1
answer
72
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 ...
- 11
1
vote
0
answers
68
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 ...
- 11
1
vote
0
answers
259
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 ...
- 583
1
vote
1
answer
149
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 ...
- 11
1
vote
1
answer
440
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 ...
- 583
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 ...
- 23
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 ...
- 31
1
vote
0
answers
52
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 ...
- 529
2
votes
1
answer
122
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 ...
- 399
1
vote
2
answers
81
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 ...
- 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 ...
- 203
3
votes
1
answer
381
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 ...
- 33
4
votes
1
answer
286
views
What Is Session Border Controller [closed]
What is Session Border Controller(SBC). And What is the Advantages of SBC. How Does It Works?
- 41
2
votes
4
answers
432
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, ...
- 84
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. ...
3
votes
0
answers
88
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 ...
- 43
1
vote
1
answer
954
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 ...
- 11
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 ...
- 63
1
vote
1
answer
967
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 ...
- 276
4
votes
2
answers
972
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 ...
- 41
1
vote
1
answer
365
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 ...
- 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 ...
5
votes
2
answers
11k
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 ...
1
vote
1
answer
740
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 ...
- 151
1
vote
1
answer
375
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 ...
- 4,371
1
vote
1
answer
295
views
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 ...
- 11
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 ...
- 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 ...
- 4,371
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/...
- 85
1
vote
1
answer
263
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 ...
- 125
1
vote
2
answers
123
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 ...
- 210
1
vote
1
answer
432
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 ...
- 11
3
votes
1
answer
640
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. ...
- 284