• ×
    Information
    Windows update impacting certain printer icons and names. Microsoft is working on a solution.
    Click here to learn more
    Information
    Need Windows 11 help?
    Check documents on compatibility, FAQs, upgrade information and available fixes.
    Windows 11 Support Center.
  • post a message
  • ×
    Information
    Windows update impacting certain printer icons and names. Microsoft is working on a solution.
    Click here to learn more
    Information
    Need Windows 11 help?
    Check documents on compatibility, FAQs, upgrade information and available fixes.
    Windows 11 Support Center.
  • post a message
Guidelines
The HP Community is where owners of HP products, like you, volunteer to help each other find solutions.
HP Recommended

I have a Polycom 670/450 which does TLS/SRTP on the Internet leg of a call.   An SBC receives the SRTP and decodes it to RTP to transit to our PBX.

When I place a call on hold and later resume....the RTP sequence numbers restart.    I'm assuming that this confuses the SRTP decoding on the SBC and causes him to not decode or decode incorrectly.

I did some additional testing to confirm my theory.    I did normal RTP instead of SRTP and we don't experience the problem.

I'm working with the SBC vendor to look at this problem, but wonder if there is anything on the phone to change the sequence number/RTP flow to not exhibit this problem.

 

Thanks for any input

5 REPLIES 5
HP Recommended

Hello Scott,

what Software Version are you running ?


Please ensure to provide some feedback if this reply has helped you so other users can profit from your experience.

Best Regards

Steffen Baier

Polycom Global Services

------------------------------------------------
Notice: I am an HP Poly employee but all replies within the community are done as a volunteer outside of my day role. This community forum is not an official HP Poly support resource, thus responses from HP Poly employees, partners, and customers alike are best-effort in attempts to share learned knowledge.
If you need immediate and/or official assistance for former Poly\Plantronics\Polycom please open a service ticket through your support channels
For HP products please check HP Support.

Please also ensure you always check the General VoIP , Video Endpoint , UC Platform (Microsoft) , PSTN
HP Recommended

4.02b

 

More data....I'm sending the SRTP to the SBC.   When I look at the unencrypted side of the SBC, he's not forwarding the RTP.   I think this helps prove my point that the SBC doesn't like something about the SRTP.

HP Recommended

Hello Scott,

 

as this is quite complex please raise a case with Polycom support.

 

Best Regards

 

Steffen Baier

------------------------------------------------
Notice: I am an HP Poly employee but all replies within the community are done as a volunteer outside of my day role. This community forum is not an official HP Poly support resource, thus responses from HP Poly employees, partners, and customers alike are best-effort in attempts to share learned knowledge.
If you need immediate and/or official assistance for former Poly\Plantronics\Polycom please open a service ticket through your support channels
For HP products please check HP Support.

Please also ensure you always check the General VoIP , Video Endpoint , UC Platform (Microsoft) , PSTN
HP Recommended

I got same problem. But, i solve this on different way.

 

Did you check type of hold option?

 

Changing option that (voIpProt.SIP.useRFC2543hold="0" voIpProt.SIP.useRFC3264HoldOnly="1" voIpProt.SIP.useSendonlyHold="1") can be useful for you.

 

Best regards.

 

HP Recommended

I solved similar issue(no voice after resume) with following options:

 

sec.srtp.holdWithNewKey="0" sec.srtp.resumeWithNewKey="0"

† The opinions expressed above are the personal opinions of the authors, not of HP. By using this site, you accept the <a href="https://www8.hp.com/us/en/terms-of-use.html" class="udrlinesmall">Terms of Use</a> and <a href="/t5/custom/page/page-id/hp.rulespage" class="udrlinesmall"> Rules of Participation</a>.