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SIP-to-SIP (CUBE) Calls Being Rejected By Provider

I have a 2821 running IOS c2800nm-adventerprisek9-mz.151-4.M7 in a lab environment. I have it configured with SIP trunks to both CUCM and a termination provider. I am using static (source ip based) authentication with the provider. When I place calls from an analog phone on an FXS port, the call connects to the PSTN just fine. When placing calls from CUCM, I get a Temporarily Unavailable error, which after much research I've found means 401 Unauthorized from this provider (annoying, I know). 

 

So, I know the problem has something to do with a configuration change I need to make in order to the calls originating from CUCM, but I'm at a loss as to what. I've tried working with the provider, but they seem to be incapable of really looking deep into things. I'll continue to work with them, but I'm asking here as well, hoping one of you has seen this before. 

Here is the INVITE sent from my gateway when dialed from an analog phone (successful):

INVITE sip:16518158320@67.205.159.100:5060 SIP/2.0
Via: SIP/2.0/TCP 10.xx.xx.xx:5060;branch=z9hG4bK48F192D
Remote-Party-ID: "Cordless 0" <sip:6125556666@10.xx.xx.xx>;party=calling;screen=no;privacy=off
From: "Cordless 0" <sip:6125556666@sip.didlogic.net>;tag=B9FD280-25D0
To: <sip:16518158320@67.205.159.100>
Date: Fri, 11 Apr 2014 19:47:30 GMT
Call-ID: F3B23EB0-C0E811E3-830AE452-E7A949D0@10.0.0.50
Supported: 100rel,timer,resource-priority,replaces,sdp-anat
Min-SE:  1800
Cisco-Guid: 4044704048-3236434403-2198201426-3886631376
User-Agent: Cisco-SIPGateway/IOS-12.x
Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, UPDATE, REFER, SUBSCRIBE, NOTIFY, INFO, REGISTER
CSeq: 101 INVITE
Max-Forwards: 70
Timestamp: 1397245650
Contact: <sip:6125556666@10.0.0.50:5060;transport=tcp>
Call-Info: <sip:10.xx.xx.xx:5060>;method="NOTIFY;Event=telephone-event;Duration=2000"
Expires: 180
Allow-Events: telephone-event
Content-Type: application/sdp
Content-Disposition: session;handling=required
Content-Length: 297
v=0
o=CiscoSystemsSIP-GW-UserAgent 8252 7196 IN IP4 10.xx.xx.xx
s=SIP Call
c=IN IP4 10.xx.xx.xx
t=0 0
m=audio 17690 RTP/AVP 0 101 19
c=IN IP4 10.xx.xx.xx
a=rtpmap:0 PCMU/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=rtpmap:19 CN/8000
a=ptime:20

And here is the SIP INVITE from the CUCM Call, note that nothing is sent after this in either case before receiving the respective Replies.

INVITE sip:16518158320@67.205.159.100:5060 SIP/2.0
Via: SIP/2.0/TCP 10.xx.xx.xx:5060;branch=z9hG4bK48D6F4
Remote-Party-ID: "Zach Bullough" <sip:651815xxxx@10.xx.xx.xx>;party=calling;screen=yes;privacy=off
From: "Zach Bullough" <sip:651815xxxx@sip.didlogic.net>;tag=B9E9608-19EA
To: <sip:1651815xxxx@67.205.159.100>
Date: Fri, 11 Apr 2014 19:46:09 GMT
Call-ID: C3674D14-C0E811E3-82FCE452-E7A949D0@10.xx.xx.xx
Supported: 100rel,timer,resource-priority,replaces,sdp-anat
Min-SE:  1800
Cisco-Guid: 3964935168-0000065536-0000000029-0051685568
User-Agent: Cisco-SIPGateway/IOS-12.x
Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, UPDATE, REFER, SUBSCRIBE, NOTIFY, INFO, REGISTER
CSeq: 101 INVITE
Timestamp: 1397245569
Contact: <sip:6518158320@10.xx.xx.xx:5060;transport=tcp>
Call-Info: <sip:10.xx.xx.xx:5060>;method="NOTIFY;Event=telephone-event;Duration=2000"
Expires: 180
Allow-Events: telephone-event
Max-Forwards: 69
Session-Expires:  1800
Content-Type: application/sdp
Content-Disposition: session;handling=required
Content-Length: 285

v=0
o=CiscoSystemsSIP-GW-UserAgent 5407 1747 IN IP4 10.xx.xx.xx
s=SIP Call
c=IN IP4 10.xx.xx.xx
t=0 0
m=audio 17212 RTP/AVP 0 101 19
c=IN IP4 10.xx.xx.xx
a=rtpmap:0 PCMU/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
a=rtpmap:19 CN/8000
a=ptime:20

 As far as I can tell, they are about as identical as they can be. Note that IPs I censored are all identical in their respective uses.

Here is what I think the relevant configuration:

sip
  bind control source-interface Vlan1
  bind media source-interface Vlan1
  session transport tcp

  header-passing

  no call service stop
  registration passthrough static


sip-ua
 permit hostname dns:east-softswitch-01.circuitid.com

 

Any tips or complete solutions are welcome. If you need more information, please let me know.

Everyone's tags (1)
4 REPLIES

401 unauthorized to me means

401 unauthorized to me means something that you send, the provider doesnt like. Did provider give you a specific DID for your trunk. I would modify your external phone number mask to be that caller ID and try again. If possible, please post full SIP debug from the gateway.

Please rate useful posts.
New Member

Hey, thanks for the reply. I

Hey, thanks for the reply. I managed to fix the SIP-to-SIP problem. I was missing a sip privacy setting in my voice class voip config. I found the recommended configuration for another Trunk provider, and that solved the problem. 

For people who come across this later, what I added was 
  asserted-id ppi

to voice service voip
 sip

 

After that, my static authenticated calls started working. Now I'm dealing with what I think is a NAT issue with dynamic (digest) authentication. Using quite a few sip-profile MODIFY commands I've managed to manually NAT my inside private network in the messages, but somehow, things are still not working right. I show as registered to my outside public IP, like I should, but once I authenticate calls through the proxy, I never receive a reply... Not sure what's happening there. 

The biggest problem lies in that I have this lab behind non-cisco equipment for the moment, pending my dedicated lab connection going in, and the consumer-grade router is not translating everything like it should... at least that's my suspicion. 

If anyone feels like helping out, here's the full config:

 

 sip
  bind control source-interface Vlan1
  bind media source-interface Vlan1
  session transport tcp
  header-passing
  error-passthru
  asserted-id ppi
  localhost dns:domain.com
  midcall-signaling passthru
  sip-profiles 1
  no call service stop
voice class sip-profiles 1
 request INVITE sip-header From modify "@.+>" "@domain.com>"
 request REGISTER sip-header From modify "@.*>" "@domain.com>"
 request REGISTER sip-header Contact modify "@.*>" "@domain.com>"
 request INVITE sip-header Contact modify "@.*>" "@domain.com>"
 request INVITE sip-header Call-Info remove
 request INVITE sdp-header Connection-Info modify "10\.0\.0\.50" "domain.com"
 request INVITE sdp-header Audio-Connection-Info modify "10\.0\.0\.50" "domain.com"
 request INVITE sdp-header Session-Owner modify "10\.0\.0\.50" "domain.com"
 request INVITE sdp-header Session-Info modify "10\.0\.0\.50" "domain.com"

sip-ua
 credentials username 170705 password 7 011535570F0E145C75 realm chicago.voip.ms
 credentials username 32046 password 7 110F2A564317195F50 realm sip.didlogic.net
 authentication username 170705 password 7 08277F1D5D1C174446 realm chicago.voip.ms
 authentication username 170705 password 7 050D355C75495C5A4D realm chicago2.voip.ms
 authentication username 32046 password 7 050D355C75495C5A4D realm sip.didlogic.net
 registrar 1 dns:chicago.voip.ms expires 3600
 registrar 2 dns:chicago2.voip.ms expires 3600
 registrar 3 dns:sip.didlogic.net expires 3600

 

dial-peer voice 30 voip
 description SHARED OUTGOING SIP PSTN 11
 translation-profile outgoing CUBE-CLEAN
 destination-pattern 01[2-9]..[2-9]......
 session protocol sipv2
 session target dns:chicago2.voip.ms
 session transport udp
 no voice-class sip block 180
 no voice-class sip block 183
 no voice-class sip block 181
 dtmf-relay sip-notify rtp-nte
 codec g711ulaw

 

And here's a sample conversation where I suddenly stop getting messages:

Apr 13 21:41:34.762: //1586/60C6C0800000/SIP/Msg/ccsipDisplayMsg:

Sent:

INVITE sip:1XXXXXXXXXX@sip.didlogic.net:5060 SIP/2.0

Via: SIP/2.0/UDP 10.0.0.50:5060;branch=z9hG4bK59E1187

From: "Zach Bullough" <sip:XXXXXXXXXX@domain.com>;tag=1654EA40-97B

To: <sip:1XXXXXXXXXX@sip.didlogic.net>

Date: Sun, 13 Apr 2014 21:41:34 GMT

Call-ID: 3800BC64-C28B11E3-8835E452-E7A949D0@domain.com

Supported: 100rel,timer,resource-priority,replaces,sdp-anat

Min-SE:  1800

Cisco-Guid: 1623638144-0000065536-0000000080-0051685568

User-Agent: Cisco-SIPGateway/IOS-12.x

Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, UPDATE, REFER, SUBSCRIBE, NOTIFY, INFO, REGISTER

CSeq: 101 INVITE

Timestamp: 1397425294

Contact: <sip:XXXXXXXXXX@domain.com>

Expires: 180

Allow-Events: telephone-event

Max-Forwards: 69

Cisco-Gcid: 37FEE753-C28B-11E3-8832-E452E7A949D0

P-Preferred-Identity: "Zach Bullough" <sip:XXXXXXXXXX@domain.com>

Session-Expires:  1800

Content-Type: application/sdp

Content-Disposition: session;handling=required

Content-Length: 274

 

v=0

o=CiscoSystemsSIP-GW-UserAgent 8376 7466 IN IP4 domain.com

s=SIP Call

c=IN IP4 domain.com

t=0 0

m=audio 18902 RTP/AVP 0 101 19

c=IN IP4 domain.com

a=rtpmap:0 PCMU/8000

a=rtpmap:101 telephone-event/8000

a=fmtp:101 0-15

a=rtpmap:19 CN/8000

a=ptime:20

 

Apr 13 21:41:34.934: //1586/60C6C0800000/SIP/Msg/ccsipDisplayMsg:

Received:

SIP/2.0 407 Proxy Authentication Required

Via: SIP/2.0/UDP 10.0.0.50:5060;branch=z9hG4bK59E1187;rport=15245;received=65.128.160.150

From: "Zach Bullough" <sip:XXXXXXXXXX@domain.com>;tag=1654EA40-97B

To: <sip:1XXXXXXXXXX@sip.didlogic.net>;tag=b27e1a1d33761e85846fc98f5f3a7e58.eef9

Call-ID: 3800BC64-C28B11E3-8835E452-E7A949D0@domain.com

CSeq: 101 INVITE

Proxy-Authenticate: Digest realm="sip.didlogic.net", nonce="U0sFulNLBI487NoK3aQj+bLy5mdhpj2ZsnxLxYA=", qop="auth"

 

Server: kamailio (4.0.3 (x86_64/linux))

Content-Length: 0

 

 

Apr 13 21:41:34.938: //1586/60C6C0800000/SIP/Msg/ccsipDisplayMsg:

Sent:

ACK sip:1XXXXXXXXXX@sip.didlogic.net:5060 SIP/2.0

Via: SIP/2.0/UDP 10.0.0.50:5060;branch=z9hG4bK59E1187

From: "Zach Bullough" <sip:XXXXXXXXXX@10.0.0.50>;tag=1654EA40-97B

To: <sip:1XXXXXXXXXX@sip.didlogic.net>;tag=b27e1a1d33761e85846fc98f5f3a7e58.eef9

Date: Sun, 13 Apr 2014 21:41:34 GMT

Call-ID: 3800BC64-C28B11E3-8835E452-E7A949D0@domain.com

Max-Forwards: 70

CSeq: 101 ACK

Allow-Events: telephone-event

Content-Length: 0

 

 

Apr 13 21:41:34.942: //1586/60C6C0800000/SIP/Msg/ccsipDisplayMsg:

Sent:

INVITE sip:1XXXXXXXXXX@sip.didlogic.net:5060 SIP/2.0

Via: SIP/2.0/UDP 10.0.0.50:5060;branch=z9hG4bK59FB7C

From: "Zach Bullough" <sip:XXXXXXXXXX@domain.com>;tag=1654EA40-97B

To: <sip:1XXXXXXXXXX@sip.didlogic.net>

Date: Sun, 13 Apr 2014 21:41:34 GMT

Call-ID: 3800BC64-C28B11E3-8835E452-E7A949D0@domain.com

Supported: 100rel,timer,resource-priority,replaces,sdp-anat

Min-SE:  1800

Cisco-Guid: 1623638144-0000065536-0000000080-0051685568

User-Agent: Cisco-SIPGateway/IOS-12.x

Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, UPDATE, REFER, SUBSCRIBE, NOTIFY, INFO, REGISTER

CSeq: 102 INVITE

Timestamp: 1397425294

Contact: <sip:XXXXXXXXXX@domain.com>

Expires: 180

Allow-Events: telephone-event

Proxy-Authorization: Digest username="32046",realm="sip.didlogic.net",uri="sip:1XXXXXXXXXX@sip.didlogic.net:5060",response="cb4e17ed3708ffe3958ea4d3f2e0cba1",nonce="U0sFulNLBI487NoK3aQj+bLy5mdhpj2ZsnxLxYA=",cnonce="D5251403",qop=auth,algorithm=md5,nc=00000001

Max-Forwards: 69

Cisco-Gcid: 37FEE753-C28B-11E3-8832-E452E7A949D0

P-Preferred-Identity: "Zach Bullough" <sip:XXXXXXXXXX@domain.com>

Session-Expires:  1800

Content-Type: application/sdp

Content-Disposition: session;handling=required

Content-Length: 274

 

 

v=0

o=CiscoSystemsSIP-GW-UserAgent 8376 7466 IN IP4 domain.com

s=SIP Call

c=IN IP4 domain.com

t=0 0

m=audio 18902 RTP/AVP 0 101 19

c=IN IP4 domain.com

a=rtpmap:0 PCMU/8000

a=rtpmap:101 telephone-event/8000

a=fmtp:101 0-15

a=rtpmap:19 CN/8000

a=ptime:20

 

Apr 13 21:41:35.438: //1586/60C6C0800000/SIP/Msg/ccsipDisplayMsg:

Sent:

INVITE sip:1XXXXXXXXXX@sip.didlogic.net:5060 SIP/2.0

Via: SIP/2.0/UDP 10.0.0.50:5060;branch=z9hG4bK59FB7C

From: "Zach Bullough" <sip:XXXXXXXXXX@domain.com>;tag=1654EA40-97B

To: <sip:1XXXXXXXXXX@sip.didlogic.net>

Date: Sun, 13 Apr 2014 21:41:35 GMT

Call-ID: 3800BC64-C28B11E3-8835E452-E7A949D0@domain.com

Supported: 100rel,timer,resource-priority,replaces,sdp-anat

Min-SE:  1800

Cisco-Guid: 1623638144-0000065536-0000000080-0051685568

User-Agent: Cisco-SIPGateway/IOS-12.x

Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, UPDATE, REFER, SUBSCRIBE, NOTIFY, INFO, REGISTER

CSeq: 102 INVITE

Timestamp: 1397425295

Contact: <sip:XXXXXXXXXX@domain.com>

Expires: 180

Allow-Events: telephone-event

Proxy-Authorization: Digest username="32046",realm="sip.didlogic.net",uri="sip:1XXXXXXXXXX@sip.didlogic.net:5060",response="cb4e17ed3708ffe3958ea4d3f2e0cba1",nonce="U0sFulNLBI487NoK3aQj+bLy5mdhpj2ZsnxLxYA=",cnonce="D5251403",qop=auth,algorithm=md5,nc=00000001

Max-Forwards: 69

Cisco-Gcid: 37FEE753-C28B-11E3-8832-E452E7A949D0

P-Preferred-Identity: "Zach Bullough" <sip:XXXXXXXXXX@domain.com>

Session-Expires:  1800

Content-Type: application/sdp

Content-Disposition: session;handling=required

Content-Length: 274

 

v=0

o=CiscoSystemsSIP-GW-UserAgent 8376 7466 IN IP4 domain.com

s=SIP Call

 

c=IN IP4 domain.com

t=0 0

m=audio 18902 RTP/AVP 0 101 19

c=IN IP4 domain.com

a=rtpmap:0 PCMU/8000

a=rtpmap:101 telephone-event/8000

a=fmtp:101 0-15

a=rtpmap:19 CN/8000

a=ptime:20

 

Apr 13 21:41:36.438: //1586/60C6C0800000/SIP/Msg/ccsipDisplayMsg:

Sent:

INVITE sip:1XXXXXXXXXX@sip.didlogic.net:5060 SIP/2.0

Via: SIP/2.0/UDP 10.0.0.50:5060;branch=z9hG4bK59FB7C

From: "Zach Bullough" <sip:XXXXXXXXXX@domain.com>;tag=1654EA40-97B

To: <sip:1XXXXXXXXXX@sip.didlogic.net>

Date: Sun, 13 Apr 2014 21:41:36 GMT

Call-ID: 3800BC64-C28B11E3-8835E452-E7A949D0@domain.com

Supported: 100rel,timer,resource-priority,replaces,sdp-anat

Min-SE:  1800

Cisco-Guid: 1623638144-0000065536-0000000080-0051685568

User-Agent: Cisco-SIPGateway/IOS-12.x

Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, UPDATE, REFER, SUBSCRIBE, NOTIFY, INFO, REGISTER

CSeq: 102 INVITE

Timestamp: 1397425296

Contact: <sip:XXXXXXXXXX@domain.com>

Expires: 180

Allow-Events: telephone-event

Proxy-Authorization: Digest username="32046",realm="sip.didlogic.net",uri="sip:1XXXXXXXXXX@sip.didlogic.net:5060",response="cb4e17ed3708ffe3958ea4d3f2e0cba1",nonce="U0sFulNLBI487NoK3aQj+bLy5mdhpj2ZsnxLxYA=",cnonce="D5251403",qop=auth,algorithm=md5,nc=00000001

Max-Forwards: 69

Cisco-Gcid: 37FEE753-C28B-11E3-8832-E452E7A949D0

P-Preferred-Identity: "Zach Bullough" <sip:XXXXXXXXXX@domain.com>

Session-Expires:  1800

Content-Type: application/sdp

Content-Disposition: session;handling=required

Content-Length: 274

 

v=0

o=CiscoSystemsSIP-GW-UserAgent 8376 7466 IN IP4 domain.com

s=SIP Call

c=IN IP4 domain.com

t=0 0

m=audio 18902 RTP/AVP 0 101 19

c=IN IP4 domain.com

 

a=rtpmap:0 PCMU/8000

a=rtpmap:101 telephone-event/8000

a=fmtp:101 0-15

a=rtpmap:19 CN/8000

a=ptime:20

 

Apr 13 21:41:38.438: //1586/60C6C0800000/SIP/Msg/ccsipDisplayMsg:

Sent:

INVITE sip:1XXXXXXXXXX@sip.didlogic.net:5060 SIP/2.0

Via: SIP/2.0/UDP 10.0.0.50:5060;branch=z9hG4bK59FB7C

From: "Zach Bullough" <sip:XXXXXXXXXX@domain.com>;tag=1654EA40-97B

To: <sip:1XXXXXXXXXX@sip.didlogic.net>

Date: Sun, 13 Apr 2014 21:41:38 GMT

Call-ID: 3800BC64-C28B11E3-8835E452-E7A949D0@domain.com

Supported: 100rel,timer,resource-priority,replaces,sdp-anat

Min-SE:  1800

Cisco-Guid: 1623638144-0000065536-0000000080-0051685568

User-Agent: Cisco-SIPGateway/IOS-12.x

Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, UPDATE, REFER, SUBSCRIBE, NOTIFY, INFO, REGISTER

CSeq: 102 INVITE

Timestamp: 1397425298

Contact: <sip:XXXXXXXXXX@domain.com>

Expires: 180

Allow-Events: telephone-event

Proxy-Authorization: Digest username="32046",realm="sip.didlogic.net",uri="sip:1XXXXXXXXXX@sip.didlogic.net:5060",response="cb4e17ed3708ffe3958ea4d3f2e0cba1",nonce="U0sFulNLBI487NoK3aQj+bLy5mdhpj2ZsnxLxYA=",cnonce="D5251403",qop=auth,algorithm=md5,nc=00000001

Max-Forwards: 69

Cisco-Gcid: 37FEE753-C28B-11E3-8832-E452E7A949D0

P-Preferred-Identity: "Zach Bullough" <sip:XXXXXXXXXX@domain.com>

Session-Expires:  1800

Content-Type: application/sdp

Content-Disposition: session;handling=required

Content-Length: 274

 

v=0

o=CiscoSystemsSIP-GW-UserAgent 8376 7466 IN IP4 domain.com

s=SIP Call

c=IN IP4 domain.com

t=0 0

m=audio 18902 RTP/AVP 0 101 19

c=IN IP4 domain.com

a=rtpmap:0 PCMU/8000

a=rtpmap:101 telephone-event/8000

a=fmtp:101 0-15

a=rtpmap:19 CN/8000

 

a=ptime:20

 

Apr 13 21:41:42.438: //1586/60C6C0800000/SIP/Msg/ccsipDisplayMsg:

Sent:

INVITE sip:1XXXXXXXXXX@sip.didlogic.net:5060 SIP/2.0

Via: SIP/2.0/UDP 10.0.0.50:5060;branch=z9hG4bK59FB7C

From: "Zach Bullough" <sip:XXXXXXXXXX@domain.com>;tag=1654EA40-97B

To: <sip:1XXXXXXXXXX@sip.didlogic.net>

Date: Sun, 13 Apr 2014 21:41:42 GMT

Call-ID: 3800BC64-C28B11E3-8835E452-E7A949D0@domain.com

Supported: 100rel,timer,resource-priority,replaces,sdp-anat

Min-SE:  1800

Cisco-Guid: 1623638144-0000065536-0000000080-0051685568

User-Agent: Cisco-SIPGateway/IOS-12.x

Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, UPDATE, REFER, SUBSCRIBE, NOTIFY, INFO, REGISTER

CSeq: 102 INVITE

Timestamp: 1397425302

Contact: <sip:XXXXXXXXXX@domain.com>

Expires: 180

Allow-Events: telephone-event

Proxy-Authorization: Digest username="32046",realm="sip.didlogic.net",uri="sip:1XXXXXXXXXX@sip.didlogic.net:5060",response="cb4e17ed3708ffe3958ea4d3f2e0cba1",nonce="U0sFulNLBI487NoK3aQj+bLy5mdhpj2ZsnxLxYA=",cnonce="D5251403",qop=auth,algorithm=md5,nc=00000001

Max-Forwards: 69

Cisco-Gcid: 37FEE753-C28B-11E3-8832-E452E7A949D0

P-Preferred-Identity: "Zach Bullough" <sip:XXXXXXXXXX@domain.com>

Session-Expires:  1800

Content-Type: application/sdp

Content-Disposition: session;handling=required

Content-Length: 274

 

v=0

o=CiscoSystemsSIP-GW-UserAgent 8376 7466 IN IP4 domain.com

s=SIP Call

c=IN IP4 domain.com

t=0 0

m=audio 18902 RTP/AVP 0 101 19

c=IN IP4 domain.com

a=rtpmap:0 PCMU/8000

a=rtpmap:101 telephone-event/8000

a=fmtp:101 0-15

a=rtpmap:19 CN/8000

a=ptime:20

 

Are you sure its matching the

Are you sure its matching the correct outgoing dial-peer ?

Because the session target configured under dial-peer 30 is chicago2.voip.ms and the call is going to sip.didlogic.net.

 

Thanks

Manish

VIP Super Bronze

We need a full picture.

We need a full picture. Please post the full debugs.

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