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Cisco ISR 4431 changing headers

Hi all,

I'm not that familiar with VOIP but we've got a client that has had a VOIP system and it goes out of a Cisco ISR4431 but they cannot do any internal transfers as they say the caller-id is translating to the WAN IP when it goes through the Cisco router and so they have asked us to disable SIP ALG which we have but this has made no difference. The packet capture see's this:

 

2020/07/24 12:48:49.612595 222.222.222.222:4642 -> 186.195.169.247:10200
INVITE sip:236@ug3-134.voipcompanysip.uk:10200 SIP/2.0
Via: SIP/2.0/UDP 222.222.222.222:4642;branch=z9hG4bK3457411109;rport
From: "user 1" <sip:230@ug3-134.voipcompanysip.uk:10200>;tag=3503966966
To: <sip:236@ug3-134.voipcompanysip.uk:10200>
Call-ID: 0_4130386172@222.222.222.222
CSeq: 1 INVITE
Contact: <sip:230@222.222.222.222:4642>
Content-Type: application/sdp
Allow: INVITE, INFO, PRACK, ACK, BYE, CANCEL, OPTIONS, NOTIFY, REGISTER, SUBSCRIBE, REFER, PUBLISH, UPDATE, MESSAGE
Max-Forwards: 70
User-Agent: Yealink SIP-T46S 66.84.0.90
Supported: from-change
Allow-Events: talk,hold,conference,refer,check-sync
Supported: replaces
Content-Length: 300

 

So the Call-ID: 0_4130386172@222.222.222.222 "should" (we think" show the internal IP of the device such as 192.168.2.33 rather than the WAN IP of 222.222.222.222 ? 

Any ideas ?

 

Thanks

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