Thank you for your reply

I do use DNS lookups:

Use DNS SRV: yes        DNS SRV Auto Prefix: yes

DNS SRV:
Whether to use DNS SRV lookup for Proxy and
Outbound Proxy.

DNS SRV Auto Prefix:
If enabled, the phone will automatically prepend the
Proxy or Outbound Proxy name with _sip._udp when
performing a DNS SRV lookup on that name

if you don't see any misconfigurations either I'll try restoring factory 
defults

On 19-12-16 15:40:13, Adrian Georgescu wrote:
> To find out the ports used for SIP TCP and TLS fro a given domain your device 
> must perform the following DNS lookups:
> 
> dig NAPTR naptr sip2sip.info
> sip2sip.info.         3599    IN      NAPTR   15 100 "s" "SIPS+D2T" "" 
> _sips._tcp.sip2sip.info.
> 
> 
> dig SRV _sips._tcp.sip2sip.info.
> _sips._tcp.sip2sip.info. 299  IN      SRV     100 10 443 proxy.sipthor.net.
> 
> The port used for TLS at this moment is 443 but it may change at any time.
> 
> 
> Regards,
> Adrian
> 
> 
> > On 16 Dec 2019, at 15:27, Michael Nagie <[email protected]> wrote:
> > 
> > Hello,
> > I need a little help.
> > I've been unable to connect to sip2sip.info via TLS with my Cisco 
> > SPA504G device for a couple of days now.
> > 
> > sip2sip.info status says: all systems operational
> > yet I can't establish a secure connection.
> > 
> > If I choose TCP transport protocol then it can connect otherwise with 
> > TLS it says 'Failed - Not Reachable'
> > 
> > Here's my configuration, it's pretty basic, I didn't change much:
> > 
> > General
> > Line Enable:  yes
> > 
> > Share Line Appearance
> > Share Ext: private                  Shared User ID:         
> > Subscription Expires: 3600  Restrict MWI: no        
> > Monitor User ID:            SCA Unseize Delay: 0
> > 
> > NAT Settings
> > NAT Mapping Enable: no      NAT Keep Alive Enable:  no      
> > NAT Keep Alive Msg: $NOTIFY     NAT Keep Alive Dest: $PROXY
> > 
> > Network Settings
> > SIP TOS/DiffServ Value: 0x68    SIP CoS Value: 3
> > RTP TOS/DiffServ Value: 0xb8    RTP CoS Value: 6
> > Network Jitter Level: high      Jitter Buffer Adjustment: up and down       
> > 
> > SIP Settings
> > SIP Transport: TLS                  SIP Port: 5060
> > SIP 100REL Enable: no               EXT SIP Port:           
> > Auth Resync-Reboot: yes             SIP Proxy-Require:      
> > SIP Remote-Party-ID: no             Referor Bye Delay: 4
> > Refer-To Target Contact: no Referee Bye Delay: 0
> > SIP Debug Option: none              Refer Target Bye Delay: 0
> > Sticky 183: no              Auth INVITE: no
> > Ntfy Refer On 1xx-To-Inv: yes       Use Anonymous With RPID: yes    
> > Set G729 annexb: none               Voice Quality Report Address:    
> > User Equal Phone: no                        
> > 
> > Call Feature Settings
> > Blind Attn-Xfer Enable: no  MOH Server:     
> > Message Waiting: no                 Auth Page: no
> > Default Ring: 1             Auth Page Realm:        
> > Conference Bridge URL:          Auth Page Password:         
> > Mailbox ID:                         Voice Mail Server:      
> > Voice Mail Subscribe Interval:  86400   State Agent:        
> > CFWD Notify Serv: no                CFWD Notifier:          
> > User ID with Domain: no             Broadsoft ACD: no       
> > Auto Ans Page On Active Call: yes Feature Key Sync: no
> > HuaWei SBC: yes             Call Park Monitor Enable: yes   
> > Enable Broadsoft Hoteling: no       Hoteling Sbscrpton Expirs:3600
> > 
> > Proxy and Registration
> > Proxy: sip2sip.info
> > Outbound Proxy:     
> > Alternate Proxy:            
> > Alternate Outbound Proxy:0
> > Use Outbound Proxy: no              Use OB Proxy In Dialog: yes
> > Register: yes                       Make Call Without Reg: no       
> > Register Expires: 3600          Ans Call Without Reg: no    
> > Use DNS SRV: yes            DNS SRV Auto Prefix: yes        
> > Proxy Fallback Intvl: 3600      Proxy Redundancy Method:normal   
> > Dual Registration: no               Auto Register When Failover:no  
> > 
> > Subscriber Information
> > Display Name: My Name           User ID: user_id
> > Password: ****                  Use Auth ID: no
> > Auth ID: user_id                Reversed Auth Realm:        
> > Mini Certificate:           
> > SRTP Private Key:           
> > Resident Online Number:         SIP URI:            
> > 
> > Audio Configuration
> > Preferred Codec:  G722      Use Pref Codec Only: no         
> > Second Preferred Codec: Unspecified Third Prfrrd Codc:Unspcfd    
> > G711u Enable: yes                   G711a Enable: yes
> > G729a Enable: yes                   G722 Enable: yes        
> > G726-16 Enable: yes                 G726-24 Enable: yes     
> > G726-32 Enable: yes                 G726-40 Enable: yes     
> > Release Unused Codec: yes           DTMF Process AVT: yes
> > Silence Supp Enable: yes    DTMF Tx Method: Auto
> > DTMF Tx Volume for AVT Packet:0 DTMF AVT Packet Interval:0
> > Use Remote Pref Codec: no   Codec Negotiation: Default      
> > Rx Payload In 18x Media Session: Use Local SDP                      
> > Dial Plan
> > Dial Plan:          
> > (*xx|[3469]11|0|00|[2-9]xxxxxx|1xxx[2-9]xxxxxxS0|xxxxxxxxxxxx.)
> > Caller ID Map:      
> > Enable IP Dialing: yes              Emergency Number:    
> > 
> > 
> > -- 
> > Best Regards,
> > 
> > Michael Nagie
> > e: [email protected]
> > _______________________________________________
> > Blink mailing list
> > [email protected]
> > https://lists.ag-projects.com/mailman/listinfo/blink
> > 
> 
> _______________________________________________
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