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Conversation not clear and some noise

allaytani2
Level 1
Level 1

Hi all,

I have configured new 10 IP phone sets to new Company, and connected to New cisco switch ( SG300-28P ) 28 POE port.

When i call any one the conversation is not clear and noisy, but most time after I close and call back again the conversation become clearly.

I don't know why this happening till now more than 3 days with the same issue to all ip phone sets.

Note: this is the first time I configure this type of switch, I have only configured the Voice Vlan , is that problem because of qulity of service not configured?

kindly help.

Regards

12 Replies 12

allaytani2
Level 1
Level 1

Any one know how to configure Voice Vlan on SG300-28P switch? i think this will help me.

this will help on voice vlan cofniguration.

https://supportforums.cisco.com/thread/2123802

Thanks Chandan I will try it and inform you.

Thanks Amanso i will check all the details and inform you.

Regards

Aman Soi
VIP Alumni
VIP Alumni

Hi Jack,

Can u provide detail what is the model of IP phones you are using ,is this problem occurring while calling internally from IP phone to IP phone or some phones are connected across WAN?

Are phones working on PoE or external adaptors are connected?

What do you mean by close by ?

I was seeing the datasheet of the Switch which says that QoS is supported by switch.

regds,

aman

Hi Chandan , I did same the configuration , but the problem not solved. some calls are clear but some are noisy like you are talking to Robot.

Hi Amanso the ip phone model : 79121 , for internal calling no problem , the problem only for outside calls.

yes phones are working on POE ,

As i said the first time I call someone number, most time the noisy is there it's look like robot, but when i disconnect the call and call back to same number the voice is clear !!

belwo is the show run output:

switche7a235#sho run

config-file-header

switche7a235

v1.2.7.76 / R750_NIK_1_2_584_002

CLI v1.0

file SSD indicator encrypted

@

ssd-control-start

ssd config

ssd file passphrase control unrestricted

no ssd file integrity control

ssd-control-end cb0a3fdb1f3a1af4e4430033719968c0

!

vlan database

vlan 250

exit

voice vlan id 250

voice vlan oui-table add 0001e3 Siemens_AG_phone________

voice vlan oui-table add 00036b Cisco_phone_____________

voice vlan oui-table add 00096e Avaya___________________

voice vlan oui-table add 000fe2 H3C_Aolynk______________

voice vlan oui-table add 0060b9 Philips_and_NEC_AG_phone

voice vlan oui-table add 00d01e Pingtel_phone___________

voice vlan oui-table add 00e075 Polycom/Veritel_phone___

voice vlan oui-table add 00e0bb 3Com_phone______________

hostname switche7a235

!

interface gigabitethernet1

storm-control broadcast enable

storm-control broadcast level 10

storm-control include-multicast

port security max 10

port security mode max-addresses

port security discard trap 60

spanning-tree portfast

switchport mode access

switchport access vlan 250

macro description ip_phone_desktop

!next command is internal.

macro auto smartport dynamic_type unknown

!

interface gigabitethernet2

storm-control broadcast enable

storm-control broadcast level 10

storm-control include-multicast

port security max 10                                

port security mode max-addresses

port security discard trap 60

spanning-tree portfast

switchport mode access

switchport access vlan 250

macro description ip_phone_desktop

!next command is internal.

macro auto smartport dynamic_type unknown

!

interface gigabitethernet3

switchport mode access

switchport access vlan 250

!

interface gigabitethernet4

switchport mode access

switchport access vlan 250

!

interface gigabitethernet5

storm-control broadcast enable

storm-control broadcast level 10

storm-control include-multicast

port security max 10                                

port security mode max-addresses

port security discard trap 60

spanning-tree portfast

switchport mode access

switchport access vlan 250

macro description ip_phone_desktop

!next command is internal.

macro auto smartport dynamic_type unknown

!

interface gigabitethernet6

storm-control broadcast enable

storm-control broadcast level 10

storm-control include-multicast

port security max 10

port security mode max-addresses

port security discard trap 60

spanning-tree portfast

switchport mode access

switchport access vlan 250

macro description ip_phone_desktop

!next command is internal.

macro auto smartport dynamic_type unknown           

!

interface gigabitethernet7

switchport mode access

switchport access vlan 250

!

interface gigabitethernet8

switchport mode access

switchport access vlan 250

!

interface gigabitethernet9

storm-control broadcast enable

storm-control broadcast level 10

storm-control include-multicast

port security max 10

port security mode max-addresses

port security discard trap 60

spanning-tree portfast

switchport mode access

switchport access vlan 250

macro description ip_phone_desktop

!next command is internal.

macro auto smartport dynamic_type unknown           

!

interface gigabitethernet10

switchport mode access

switchport access vlan 250

!

interface gigabitethernet11

storm-control broadcast enable

storm-control broadcast level 10

storm-control include-multicast

port security max 10

port security mode max-addresses

port security discard trap 60

spanning-tree portfast

switchport mode access

switchport access vlan 250

macro description ip_phone_desktop

!next command is internal.

macro auto smartport dynamic_type unknown

!

interface gigabitethernet12

switchport mode access

switchport access vlan 250                          

!

interface gigabitethernet13

storm-control broadcast enable

storm-control broadcast level 10

storm-control include-multicast

port security max 10

port security mode max-addresses

port security discard trap 60

spanning-tree portfast

switchport mode access

switchport access vlan 250

macro description ip_phone_desktop

!next command is internal.

macro auto smartport dynamic_type unknown

!

interface gigabitethernet14

switchport mode access

switchport access vlan 250

!

interface gigabitethernet15

storm-control broadcast enable

storm-control broadcast level 10                    

storm-control include-multicast

port security max 10

port security mode max-addresses

port security discard trap 60

spanning-tree portfast

switchport mode access

switchport access vlan 250

macro description ip_phone_desktop

!next command is internal.

macro auto smartport dynamic_type unknown

!

interface gigabitethernet16

switchport mode access

switchport access vlan 250

!

interface gigabitethernet17

storm-control broadcast enable

storm-control broadcast level 10

storm-control include-multicast

port security max 10

port security mode max-addresses

port security discard trap 60                       

spanning-tree portfast

switchport mode access

switchport access vlan 250

macro description ip_phone_desktop

!next command is internal.

macro auto smartport dynamic_type unknown

!

interface gigabitethernet18

storm-control broadcast enable

storm-control broadcast level 10

storm-control include-multicast

port security max 10

port security mode max-addresses

port security discard trap 60

spanning-tree portfast

switchport mode access

switchport access vlan 250

macro description ip_phone_desktop

!next command is internal.

macro auto smartport dynamic_type unknown

!

interface gigabitethernet19                          

storm-control broadcast enable

storm-control broadcast level 10

storm-control include-multicast

port security max 10

port security mode max-addresses

port security discard trap 60

spanning-tree portfast

switchport mode access

switchport access vlan 250

macro description ip_phone_desktop

!next command is internal.

macro auto smartport dynamic_type unknown

!

interface gigabitethernet20

switchport mode access

switchport access vlan 250

!

interface gigabitethernet21

storm-control broadcast enable

storm-control broadcast level 10

storm-control include-multicast

port security max 10                                

port security mode max-addresses

port security discard trap 60

spanning-tree portfast

switchport mode access

switchport access vlan 250

macro description ip_phone_desktop

!next command is internal.

macro auto smartport dynamic_type unknown

!

interface gigabitethernet22

storm-control broadcast enable

storm-control broadcast level 10

storm-control include-multicast

port security max 10

port security mode max-addresses

port security discard trap 60

spanning-tree portfast

switchport mode access

switchport access vlan 250

macro description ip_phone_desktop

!next command is internal.

macro auto smartport dynamic_type unknown           

!

interface gigabitethernet23

switchport mode access

switchport access vlan 250

!

interface gigabitethernet24

switchport mode access

switchport access vlan 250

!

interface gigabitethernet25

switchport mode access

switchport access vlan 250

!

interface gigabitethernet26

switchport mode access

switchport access vlan 250

!

interface gigabitethernet27

switchport mode access

switchport access vlan 250

!

interface gigabitethernet28                          

spanning-tree link-type point-to-point

switchport trunk allowed vlan add 250

macro description switch

!next command is internal.

macro auto smartport dynamic_type switch

!



Hi Jack,

To isolate the problem, do you have IP phone of different model  or any other cisco switch  with POE.

Secondly, are u facing this problem with all 7912 IP phones.

regds,

aman

Hi Amanso,

I tested two IP phone different type "7940"  found is working with no issue.

The only problem is with all 7912 type, how come ? it is all new !!!

Is that means it is type problem ?

Regards

check for a firmware upgrade for 7912.

Hi Jack,

Few questions:

a. What is Call Manager version ?

b. What is the firmware version for 7912 and signalling protocol?

c. What is gateway model along with IOS version?

b. Is 7940 working on PoE?

regds,

aman

Hi Jack,

Can u try configuring command switchport voice vlan 250 under the port where 7912 is connected?

I was just checking for bugs and could be the cause for your problem.

CSCed01620 Bug Details

7912 in voice vlan processes ALL packets destined to its MAC address
Symptoms:
- phone may accept DHCP setting from a different vlan
- phone freezes (softkeys do not work)
- phone resets
- bad voice quality

Conditions:

This has been seen with:
- CP79120100SCCP030204A
- CP7912010200SCCP031023A
- ?

Workaround:

configure the port of the switch connecting to the 7912, to be an access port in the voice vlan

This is not a real workaround, but it will prevent the switch from forwarding packets from other
vlans destined to the phone, to the phone.

regds,

aman

Hi Amanso,

I have changed all the IP phones to 7911, but the problem remains?!!!!!

no there is no such like this command in this switch type, "switchport voice vlan 250".

tomorrow i will change the switch, and see what will happen.

Regards

Hi Jack,

Did u get a chance to change the switch?

Any results.

regds,

aman