one-way Audio with VOIP on Cisco 1861

[Frank Hohenadel]

Hi,

I'm having problems in configuring my SIP accout on my Cisco 1861 router. The router registers successfully at the sip provider, calling from inside/outside works fine.

After establishing the sip call there is only one-way audio from outside to the router/phone. No audio is send in the other direction (from the phone/router to the sip provider).

Configuration is attatched

Any idea where the problem is? Thanks for any help.

Regards, Frank

[paolo bevilacqua]

Wrong forum, post in "IP Telephony". You can move your posting using the Actions panel on the right.

[islam.kamal]

Hello

can you please find the below configuration for your issue , i think you have to configure MTP

sccp local vlan 1

sccp ccm 10.10.10.1 identifier 1 version 7.0

sccp

!

sccp ccm group 1

bind interface vlan 1

associate ccm 1 priority 1

associate profile 1 register MOTMTP

dspfarm profile 1 mtp 

codec pass-through

codec g711ulaw

maximum sessions software 200

associate application SCCP

telephony-service

sdspfarm units 3

sdspfarm transcode sessions 8

sdspfarm tag 1 MOTMTP

Thank you

please rate all useful information

[Frank Hohenadel]

Hello,

doesn't help. Problem is still the same. Attached the updated configuration

Regards, Frank

[islam.kamal]

Hi

Most of the time ip routing will be the problem of firewall which can stop RTP .Can you do a call and do "debug ccsip messages" and share with us?.

Please find the below:-

1-

I am sorry you have to do the below to enable the MTP on your router

dspfarm profile 1 mtp 

no shutdown

2-

voice service voip

sip

header-passing

Thanks

please rate all useful information

[Carlo Poggiarelli]

Hi Frank.
Under sip-ua try to add
nat symmetric role active
nat symmetric check-media-src

HTH
Regards
Carlo

Sent from Cisco Technical Support iPhone App

[clileikis · Accepted solution]

Try removing the SIP bind source control/media commands.

HTH,

Chris

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[Frank Hohenadel]

Hi Chris,

it worked out well. Thank you so much.

Thanks to all others as well for helping

Best Regards, Frank