MIKROTIK VPN/PPTP FOR VOIP
Yesterday I was configuring a site to site VPN/pptp connectivity at a remote location, As showed in the above diagram. All connectivity and functions were working fine. Ping from client to client behind each mikrotik was working fine, clients could see each other directly without NATTING, but strangely SIP/VOIP packets were not passing through. upon running TORCH , I could see the SIP traffic on UDP port 5060 was working but in very low volume , in bits. After running some sniffing, I found out that the problem was with the poor implementation at SIP protocol level on most commercial routers and the fact that this technology is just useful for outgoing calls, but not for incoming calls
After turning off SIP ALG (SIP Helper) ,everything start working .
Either by GUI or via CLI
GUI:
Goto IP > Firewall > Services > SIP [and disable it]
CLI:
/ip fi service-port disable sip
Now VoIP calls are working perfectly. Writing this, just in case some one else may face this issue with banging his head on the wall 😉
.
Regard’s
SYED JAHANZAIB
Syed Jahanzaib - Personal Blog to Share Knowledge ! 
Can you send the entire configuration of all the routers please
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Comment by khizer — November 13, 2014 @ 11:59 AM
Bro I want to block SIP ports in my network I am really upset about this kindly help me out
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Comment by Muhammad Ismail — February 17, 2015 @ 9:25 PM
Hey dude,
hi 5!
It worked perfectly. You are awsome…!! Great suggestion… bro….
I was really near to bang my head but came across ur post…..!!!!!
thanks again
Regards
Masood
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Comment by masood24 — February 23, 2015 @ 1:57 PM
I am glad it helped 🙂
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Comment by Syed Jahanzaib / Pinochio~:) — February 23, 2015 @ 2:16 PM
Cara comigo nao funcionou, mikrotik esta bloqueado a porta 5060 a sair para meu servidor externo,
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Comment by edson — August 19, 2016 @ 12:33 AM
i have tried it but its not working on my own.i am only having one way audio issue among the vlans. if i disable the NAT, i will have two way audio but the other user cannot call.am not calling outside my network.
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Comment by Collins — October 17, 2016 @ 10:05 PM
help me, configuration of routers mikrotik voip,,, please no… sounds
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Comment by rajatimbangan1 — March 31, 2015 @ 8:28 AM
Dear Sir,
I am use one live ip and nat with 50.50.50.0/24 ip pool.but every time my wan ip go to black list.so i need your help.can we use lan live ip for multiple nat with fake pool pool???i sent you my map also please study it and please ans me.
Thank You
Sir
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Comment by jatin — May 27, 2015 @ 2:23 PM
Dear Sir,
Please Help Me………..I need this configuration in Mikrotik
Please See Link
http://www.tp-link.in/article/?id=383
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Comment by jatinnijash — May 27, 2015 @ 3:25 PM
how can i create sip server in mikrotik
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Comment by kimet papraniku — September 23, 2015 @ 9:44 PM
Hi jahanzaib,
I have pabx gateway on central office and on brand office , i want setup pabx client connect to pabx central used tunnel ipip via internet ( ip public ) .
Could help me configuration mikrotik both side and recommend type of mikrotik support it.
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Comment by muhammad nurmatin — July 1, 2016 @ 9:41 PM
you can simply install any mikrotik like rb750gl on both end ,
at central office configure vpn pptp server , then on branch office dial into central pptp server, this way your broth ends will be connected to each other on virtual LAN and you can do whatever you like.
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Comment by Syed Jahanzaib / Pinochio~:) — July 3, 2016 @ 10:00 AM
Thats was awesome, man, helped me solve a problem in minutes! Thanks so much!
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Comment by capemac — August 22, 2016 @ 6:24 PM
Hi,my own case is some how different .I have a Cisco VoIP server .if hotspot is disabled ,users can call each other without stress .i want the users to be able to call each other without log into the hotspot or disabling the hotspot.I hhave configured the VoIP server IP in the wall garden IP list as well as bypassing the Mac address of the VoIP server under IP binding .the challenge is that users can call but the video and audio are disabled.can some one assist ?I have opened the sip port 5060 under nat rule but no luck.can you assist me ?
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Comment by Collins — November 19, 2017 @ 11:06 PM