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Questions tagged [voice]

For questions about Voice being transported on a computer network. Like VoIP, this tag should be used in relation to any configuration or troubleshooting that involves Voice traffic and Voice data. Remember that this tag should only be used when the questions involves an on topic network device.

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DATA & VOICE VLAN ROUTING BETWEEN 2 ROUTERS [closed]

Good Afternoon All- I would appreciate a little help with a current issue I am facing... I can ping all Network Segments, all Routers, all Switches, and all Servers on the network. PROBLEM IS: I CAN'T ...
NetAdmin's user avatar
5 votes
1 answer
391 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
3 answers
1k views

Ip phone problem cannot get an ip address from dhcp using other vlans except from vlan 1

i am trying to understand native vlans. when i use vlan 1 it worked and it provides an ip address to my ip phone. When using vlan 100 it does not work even i tried using native trunking on it. please ...
theweebokid'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
4 votes
1 answer
2k views

Best Practice for Voice and Data VLAN on single port

We have multiple interfaces currently configured with the below on our Cisco 3750x switch. interface GigabitEthernet1/0/21 switchport access vlan 4 switchport trunk encapsulation dot1q switchport ...
Craken's user avatar
  • 681
4 votes
1 answer
279 views

What are reasons to configure a Voice VLAN using the Auxillary VLAN feature instead of a Trunk + Native vLAN

Imagine this topology: [PC] ------- [VOIP Phone] ------- [eth0/0 on a Switch] And this configuration on the switch: vlan 22 name DATA vlan 33 name VOICE There are two ways to have both the PC'...
rsic's user avatar
  • 43
0 votes
1 answer
2k 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
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
1 answer
100 views

Can we use VRFs for BW preservation across the MPLS network?

I have some ingress untagged voice traffic coming through the MPLS network and obviously I have some concerns about this traffic being de-prioritised should there is congestion on the MPLS backhaul. ...
Pablo Ávila Flores's user avatar
2 votes
2 answers
5k views

Cisco Voice VLAN (DHCP not working)

Having an issue with a voice vlan setup but only on my Cisco stack, Brocade stack works. DHCP is on VLAN5 (for phone and pc) using Option 156 for voice VOIP is on VLAN100 Shoretel Phone1 and PC1 on ...
Sam's user avatar
  • 23
2 votes
2 answers
410 views

Forward single DID number to sip trunk

I am stuck on a project and need help. I have setup a SIP trunk on Cisco 2900 router to another vendors call server which is based on asterisk(custom application). We have phones register with the ...
gnome247's user avatar
1 vote
1 answer
66 views

PSTN Connection

So I have a CUCM sever setup and a few phones setup, I have a 1841 router as the default gateway for the network and I am looking at branching out from just internal extension calls. I have a VWIC-...
NickCarlt's user avatar
2 votes
1 answer
361 views

How does a switch handle 2 VLAN's on same port such as voice + access vlan

I'm trying to understand how a switch handles two vlan's on the same port, in the case of a voice vlan + access vlan. If you connect an ip phone to a switch and then a laptop to the switch at the ...
user avatar
2 votes
1 answer
4k views

Auto Voice VLAN on Catalyst 2960X running IOS 15.2(2)

I am looking to reproduce a configuration that I have quite easily achieved on the Cisco Small Business Series SG500 family of switches. The configuration is for Auto Voice VLAN, triggered by CDP and/...
sardean's user avatar
  • 562
3 votes
2 answers
136 views

Is a 10/100 switch sufficient for Voice?

Seems like a rudimentary question, but I'd like to use an "old" HP Procurve 2610 10/100 switch to provide POE connectivity to a new batch of ~25 deskphones. It appears as though a generic bandwidth ...
Ted Quanstrom's user avatar
1 vote
1 answer
686 views

Converting SIP to TDM?

We're looking to implement DID calling. Our local provider has indicated they can provide this via a SIP trunk, but cannot provide an E1. We also don't think they can provide an E1-over-SIP (where ...
dividius's user avatar
  • 113
0 votes
1 answer
1k views

DHCP not working in Voice Vlan [closed]

Description: I have an Admin Network which primarly which provides services for admin data (Company) Service Vlan 1-100 & IP telephony services (Two Vlan 200 & 250). This network is now ...
Faizan Nizam's user avatar
1 vote
2 answers
978 views

Unable to register 2 phones in Call Manager - Lab

I am looking for some advice to get 2 phones registered in Call manager. I have 2, only 2 connected that I'm trying to get up and working in my Lab. CM shows them as never being seen, but I can edit ...
user2341085's user avatar
2 votes
1 answer
98 views

Voice Home Lab Cisco Devices

I have following configuration for my home lab - I have configured 4 VLAN interfaces - 10.10.10.10(R1-Vlan 100), 20.20.20.20(R2-Vlan 200), 30.30.30.30(R3-Vlan 300) and 40.40.40.40(R4-Vlan 400). There ...
MUSR's user avatar
  • 536
1 vote
1 answer
6k views

Why and when do we use digit '9' before making an outbound call?

Also explain when do we use this feature (Please explain for both VOIP & Traditional telephony system)? Why we use this feature? what problems shall we face if we don't use '9' before making ...
Heisenberg's user avatar
1 vote
2 answers
12k views

Configuration of voice VLAN in HP switch

I have to configure an IP EPABX e.g., an NEC 9100 series. I have an HP managed PoE switch. We have existing VLANs 5 and 50. VLAN 5 is for wireless/guests, and VLAN 50 is for the Internet. VLAN 5: ...
de.walkar's user avatar
  • 433
2 votes
2 answers
2k views

Nexus 7000 - switchport Voice configuration

Nexus 7k NXOS 6.2(8a) I am trying to configure a voice vlan but the command does not seem available? Is there something I am missing to enable that? interface Ethernet4/1 description ...
Ippy's user avatar
  • 345
2 votes
1 answer
3k views

HP Procurve - Configure Voice VLAN

I have a HP 2810-48G that I would like to configure for a voice vlan. On our other HP switches (2800, 2610, 2530, etc.) I would navigate to the correct vlan and then type "voice". On the 2810 when I ...
JPoole's user avatar
  • 143
0 votes
1 answer
162 views

Auto-Attendant on Cisco CUC

I'm trying to apply an auto-attendant on a CUC, where the voice message will be just played for one time and stops, and if the caller didn't dial anything the call would hangup after 10 sec. I know ...
user2600543's user avatar
1 vote
2 answers
2k views

CISCO CUBE is as SBC suitable for ISP

I am currently planning a voice network and test different ways. Currently a classic IP network with various Cisco Routers is used to bound different media (fiber, copper, MPLS) and route to a classic ...
kockiren's user avatar
  • 423
3 votes
3 answers
1k views

What is the exact engineering involved behind creating a SIP trunk for any customer?

When a company is setting up a PBX and wants to use a SIP trunk, why does it have to buy it? Is there no way to provide itself with one on its own?
ak_nama's user avatar
  • 141
2 votes
1 answer
48 views

Phone signaling encryption

If we encrypt the signaling between the phones and call manager but not the voice packets, can the call still be intercepted, reassembled and listened to?
Robert's user avatar
  • 21
9 votes
2 answers
2k views

Voice VLAN information

I am aware of the ability to show the access VLAN assigned to an interface on a cisco switch. How about showing specifically the voice VLAN an interface is assigned? #show run int fa1/47 interface ...
eric's user avatar
  • 512
10 votes
1 answer
10k views

What is "1 Erlang" for network data traffic?

I understand (or at least I believe I do) the concept of Erlang load unit when it is applied to voice communications. Voice communications occur in real-time and measured against real-time, so ...
AnT stands with Russia's user avatar
9 votes
4 answers
3k views

Switch interface config for IP Phones

I have seen both of the following methods of switch interface configuration for supporting IP Phones. switchport access vlan <data-vlan> switchport voice vlan <voice-vlan> switchport ...
Mike Marotta's user avatar
  • 2,057
7 votes
2 answers
5k views

Is a DSP required with a SIP trunk?

Assuming a Cisco 3825 router, if the Cisco SCCP phones on the network are using G.711 µ-law and are traversing a CUCME system connected to a SIP trunk that supports G.711 µ-law, is a PVDM2 DSP card ...
WaxTrax's user avatar
  • 941
7 votes
3 answers
2k views

What are the components and licensing of a full Cisco CUCME PBX?

I've been placed in charge of replacing an older Avaya TDM PBX with a new VoIP system that will integrate with Exchange (at least in the capability to transcribe voicemail messages and deliver them to ...
WaxTrax's user avatar
  • 941