Hello again,
First of all lets make a correction to my previous post (almost 6 months ago). The problem with the registration of multiple SIP accounts (while you use Enterprise firmware) is related ONLY with 8821 and NOT with all 8800 series. I already checked other models (such as CP-8861-K9) and you can easily register multiple SIP accounts (with Asterisk or so) without issues. The only restriction you may have is that you are not able to use more than one SIP server per phone. Multiple accounts yes (depending on model's specs & keys), but all should belong on the same SIP server. Once again, we are talking for phones wearing Enterprise firmware and NOT 3PCC. And unfortunately there is no 3PCC firmware for 8821.
Now back to our main issue which is the multiple SIP account registration on 8821, I would like to declare that finally I managed to solve it and I am able to have up to 6 different SIP accounts registered in a "pure" asterisk v15 server. And I used the word "pure" because alternatively, there is a solution you may came across out there providing patches for asterisk sources to give you the ability to have multiple lines via bulk-registration (usecallmanager.nz) My solution does not need any patch or special compilation knowledge.
Because I wanna make the story very clear to everyone, I have to mention from the beginning that 8821 CANNOT use more than one-set of credentials (username/authName & password). So keep always in your mind that by using this beautiful wifi phone you have to accept that one-set of credentials should be shared for all of the accounts you may need to register on it. You cannot avoid this fact unless Cisco decide to write a 3PCC firmware for it. (...dream on)
So, all you have to do next is to create as much new PJSIP accounts you may need register (untill 6 actually), but you should set the same password for both of them. As an example, let say you need 3 accounts:
username / authID: 101
password: shared123pass456
username / authID: 102
password: shared123pass456
username / authID: 103
password: shared123pass456
Now you need a way to make your newly created PJSIP accounts (above) to have the same username as well. And this can be done by adding the following lines to /etc/asterisk/pjsip_custom_post.conf
[101-auth](+type=auth)
username=ausernameforall
[102-auth](+type=auth)
username=ausernameforall
[103-auth](+type=auth)
username=ausernameforall
And voila! Reload your asterisk and you should have 3 (or more) PJSIP accounts with the same set of credentials. In our example:
username / authName: ausernameforall
authID: 101
passsword: shared123pass456
username / authName: ausernameforall
authID: 102
passsword: shared123pass456
username / authName: ausernameforall
authID: 103
passsword: shared123pass456
Now add your accounts into your SEP{mac}.cnf.xml and finished :
<line button="1">
<featureID>9</featureID>
<featureLabel>Account 101 label</featureLabel>
<proxy>USECALLMANAGER</proxy>
<port>5160</port>
<name>101</name>
<displayName>101</displayName>
<authName>ausernameforall</authName>
<authPassword>shared123pass456</authPassword>
...
<line button="2">
<featureID>9</featureID>
<featureLabel>Account 102 label</featureLabel>
<proxy>USECALLMANAGER</proxy>
<port>5160</port>
<name>102</name>
<displayName>102</displayName>
<authName>ausernameforall</authName>
<authPassword>shared123pass456</authPassword>
...
<line button="3">
<featureID>9</featureID>
<featureLabel>Account 103 label</featureLabel>
<proxy>USECALLMANAGER</proxy>
<port>5160</port>
<name>103</name>
<displayName>103</displayName>
<authName>ausernameforall</authName>
<authPassword>shared123pass456</authPassword>
...
Thats all !!! Your 8821 should now have three (3) or more different PJSIP accounts perfectly registered individually on your asterisk SIP server like any other Cisco multiline phone without having to patch, compile and reinstall any customized version of asterisk :)))
P/S: I also have another tricky way to do something similar with legacy SIP accounts (instead of PJSIP) but as I said in my previous post, I am ashamed to suggest it :))))
Good luck and enjoy your 8821 even if it's almost at its eol (July 2023)
