# rtsp announce to WMS with port forwarding/NAT

**URL:** <https://community.wowza.com/t/rtsp-announce-to-wms-with-port-forwarding-nat/38101>\
**Category:** Wowza Streaming Engine\
**Created:** [March 11, 2013, 11:35am UTC](https://community.wowza.com/t/rtsp-announce-to-wms-with-port-forwarding-nat/38101 "2013-03-11T11:35:49Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Sascha\_Dierberg](https://avatars.discourse-cdn.com/v4/letter/s/6f9a4e/32.png) [@Sascha\_Dierberg](https://community.wowza.com/u/Sascha_Dierberg)\
**Post date:** [March 11, 2013, 11:35am UTC](https://community.wowza.com/t/rtsp-announce-to-wms-with-port-forwarding-nat/38101/1 "2013-03-11T11:35:49Z")

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We have multiple rtsp encoders behind a NAT that will announce streams to a WMS. How can I tell WMS to use a forwarding port instead of 554 to pull a streams from clients?

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**Author:** ![Richard\_Lanham](https://avatars.discourse-cdn.com/v4/letter/r/c68b51/32.png) [@Richard\_Lanham](https://community.wowza.com/u/Richard_Lanham)\
**Post date:** [March 11, 2013, 2:48pm UTC](https://community.wowza.com/t/rtsp-announce-to-wms-with-port-forwarding-nat/38101/2 "2013-03-11T14:48:25Z")

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Wowza can pull a rtsp stream over any port as long as it is not blocked by a firewall and is properly mapped in your network to the Wowza server. Take a look at these guides:

[https://www.wowza.com/docs/how-to-set-up-an-application-for-rtsp-rtp-streaming](https://www.wowza.com/docs/how-to-set-up-an-application-for-rtsp-rtp-streaming)

[https://www.wowza.com/docs/how-to-troubleshoot-rtsp-rtp-playback](https://www.wowza.com/docs/how-to-troubleshoot-rtsp-rtp-playback)

Richard

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**Author:** ![Sascha\_Dierberg](https://avatars.discourse-cdn.com/v4/letter/s/6f9a4e/32.png) [@Sascha\_Dierberg](https://community.wowza.com/u/Sascha_Dierberg)\
**Post date:** [March 11, 2013, 4:12pm UTC](https://community.wowza.com/t/rtsp-announce-to-wms-with-port-forwarding-nat/38101/3 "2013-03-11T16:12:18Z")

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Thank you Richard, but I assume you missunderstud me.

Our rtsp encoders are behind a NAT and can reach WMS with rtsp ANNOUNCE. Later if one of these encoders will be requested the WMS should establish a new rtsp session to pull these streams from the NATing router with port forwarding. But how can I tell WMS to use a specific port for NAT traversal? (WMS and NAT have public IP, but dynamic changes, so it cant be configured in WMS)

enc1 – \

enc2------- NAT -------------------- WMS \<---- webclient

enc3—/

Announce1 ---------\>

Announce2 ---------\>

Announce3 ---------\>

Announce4 ---------\>

\<------- PLAY :55544 stream 3

Can I put something in the SDP part of the ANNOUNCE msg which let WMS use another port then 554?

Thanks in advance - Sascha